Answer:
6
Step-by-step explanation:
ratio is 3 parts boys to 7 parts girls = 10 parts total.
boys make up 3/10 of the total.
20 children.
so boys = (3/10) X 20 = 60/10 = 6.
a population that is normally distributed has a mean of 164 and standard deviation of 18.65. if a sample of size 50 was taken from this population, what is the probability its mean would be greater than 168? show how you arrived at your answer. round to the nearest tenth of a percent.
The probability that the sample mean is greater than 168 is approximately 0.0655, or 6.6% (rounded to the nearest tenth of a percent).
To find the probability that the sample mean is greater than 168, we can use the central limit theorem and the properties of the normal distribution.
The central limit theorem states that for a large enough sample size (in this case, n = 50), the distribution of sample means will approach a normal distribution, regardless of the shape of the population distribution.
Given that the population mean is 164 and the population standard deviation is 18.65, we can calculate the standard deviation of the sample mean, also known as the standard error, using the formula:
Standard Error (SE) = Population Standard Deviation / √(Sample Size)
SE = 18.65 / √50
SE ≈ 2.636
Next, we need to standardize the value of 168 using the sample mean and the standard error. This allows us to calculate the probability using the standard normal distribution.
Z = (Sample Mean - Population Mean) / Standard Error
Z = (168 - 164) / 2.636
Z ≈ 1.516
To find the probability that the sample mean is greater than 168, we can look up the corresponding area under the standard normal curve to the right of Z = 1.516. This can be done using a standard normal distribution table or a statistical calculator.
Using a standard normal distribution table, we find that the area to the right of Z = 1.516 is approximately 0.0655.
Therefore, the probability that the sample mean is greater than 168 is approximately 0.0655, or 6.6% (rounded to the nearest tenth of a percent).
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Should a normality test be run as part of every experiment?
Explain.
A normality test is run as part of every experiment, to find out if a sample data comes from a normally distributed population. It is essential to determine whether a sample data comes from a normal distribution before performing any statistical analysis on it.
Normality tests are important because many statistical tests, including the t-test and the analysis of variance (ANOVA), depend on the assumption of normality. If the data are not normally distributed, the results of the analysis may be incorrect, leading to wrong conclusions. Normality tests are used to determine whether the data is normally distributed or not. The most commonly used normality tests are the Shapiro-Wilk test, the Anderson-Darling test, the Kolmogorov-Smirnov test, and the Lilliefors test.
If the p-value is less than or equal to the level of significance, then the null hypothesis is rejected, which means that the data is not normally distributed. In conclusion, a normality test should be run as part of every experiment to check the normality of the data. If the data are not normally distributed, then the results of the analysis may be incorrect, leading to wrong conclusions. Therefore, normality tests are essential for ensuring the validity of the statistical analysis.
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the minute hand of a $12$-hour clock measures $10$ cm from its tip to the center of the clock face, and the hour hand from its tip to the center of the clock face is $5$ cm. what is the sum of the distances, in meters, traveled by the tips of both hands in one $24$-hour period? express your answer to the nearest thousandth of a meter.
Therefore, the sum of the distances traveled by the tips of both hands in one $24$-hour period is approximately $15.708$ meters.
To start, we need to find the length of each hand. The minute hand measures $10$ cm, which is equivalent to $0.1$ meters, and the hour hand measures $5$ cm, or $0.05$ meters.
Now, let's consider the distance each hand travels in one hour. The minute hand travels the circumference of the clock face, which has a diameter of $20$ cm or $0.2$ meters. The formula for the circumference of a circle is $2\pi r$, so the distance traveled by the minute hand in one hour is $2\pi(0.1) = 0.2\pi$ meters.
The hour hand travels the circumference of a circle with a diameter of $10$ cm or $0.1$ meters. Since the hour hand takes $12$ hours to complete one full revolution around the clock face, it travels $\frac{1}{12}$ of the circumference in one hour. Therefore, the distance traveled by the hour hand in one hour is $\frac{1}{12} \cdot 2\pi(0.05) = \frac{\pi}{120}$ meters.
To find the total distance traveled by both hands in $24$ hours, we can add up the distance traveled by each hand in one hour and multiply by $24$.
Total distance = $24\left(0.2\pi + \frac{\pi}{120}\right) \approx 15.708$ meters
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context switching is required by all preemptive algorithms.
true/false
The given statement "context switching is required by all preemptive algorithms " is False.
Context switching is not required by all preemptive algorithms. Preemptive algorithms allow the operating system to interrupt the currently executing process and switch to another process.
Context switching involves saving the state of the currently running process and restoring the state of the next process to be executed. While context switching is a common mechanism in preemptive scheduling algorithms, there are non-preemptive algorithms that do not require context switching as they allow processes to run until they voluntarily release the CPU.
So, the statement that context switching is required by all preemptive algorithms is false.
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What is the volume of a cylinder with a height of 19.1 in and a base with a diameter of
12.8 in, to the nearest tenth of a cubic inch?
Answer:
V = 2458.10 cubic inches
Step-by-step explanation:
11) In AXYZ, x = 20.5, y = 11.8, and m< x = 55.4°. Which statement can be used to find the value of xy?
The statement that can be used to find the value of xy is D. cos m< x = xy/y. Explanation: Let us see what we are given and what we need to find.
Given: A xyz is a triangle with x = 20.5, y = 11.8, and[tex]m < x = 55.4[/tex]°We need to find: Value of xy Step-by-step explanation: In a right triangle, the cosine of an angle is equal to the ratio of the adjacent side to the hypotenuse. [tex]cos m < x = xy/y cos 55.4 = xy/20.5xy = 20.5 × cos 55.4 = 20.5 × 0.5736 ≈[/tex]11.76Therefore, the value of xy is approximately 11.76.
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Please help ! Look at the image below !!
The fraction that represents a repeating decimal when converted is given as follows:
2/11.
How to convert a fraction to a decimal number?A fraction is represented by the division of a term x by a term y, such as in the equation presented as follows:
Fraction = x/y.
The terms that represent x and y are listed as follows:
x, which is the top term of the fraction, is called the numerator.y, which is the bottom term of the fraction, is called the denominator.The decimal representation of each fraction is given by the division of the numerator by the denominator, hence:
1/8 = 0.125.2/11 = 0.222... -> repeating decimal.13/20 = 0.65.4/5 = 0.8.A similar problem, also featuring fractions, is presented at brainly.com/question/1622425
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What is the general solution to the differential equation (dy)/(dx)=(x-1)/(3y^2) for y>0? What is the general solution to the differential equation ( ...
The general solution to the second differential equation for y > 0 is (1/3)y^3 = x^2 + 3x + C
To find the general solution to the differential equation (dy)/(dx) = (x-1)/(3y^2) for y > 0, we can separate the variables and integrate.
For the first differential equation:
(dy)/(dx) = (x-1)/(3y^2)
We can rewrite it as:
(3y^2) dy = (x-1) dx
Now we integrate both sides:
∫(3y^2) dy = ∫(x-1) dx
Integrating, we get:
y^3 = (1/2)x^2 - x + C
Where C is the constant of integration.
This is the general solution to the differential equation for y > 0.
For the second differential equation:
(dy)/(dx) = (2x+3)/(y^2)
We can follow the same steps as before:
y^2 dy = (2x+3) dx
Integrating, we get:
(1/3)y^3 = x^2 + 3x + C
Where C is the constant of integration.
This is the general solution to the second differential equation for y > 0.
In both cases, the constant of integration represents the family of all possible solutions to the differential equation.
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Consider the space C([0, 1]) of real-valued continuous functions on [0, 1] endowed with the sup-norm (or uniform norm) ∥ · ∥[infinity]. Let the set B ⊂ C([0, 1]) be B = {f ∈ C([0, 1]) | 0 ≤ f(x) ≤ 2, ∀ x ∈ [0, 1]} .
Show that B is closed and bounded (with respect to the sup-norm).
Show that B is not compact.
Consider the space [tex]C([0, 1])[/tex]of real-valued continuous functions on [0, 1] endowed with the sup-norm (or uniform norm[tex]) ∥ · ∥[infinity]. Let the set B ⊂ C([0, 1]) be B = {f ∈ C([0, 1]) | 0 ≤ f(x) ≤ 2, ∀ x ∈ [0, 1]} .[/tex]
Show that B is closed and bounded (with respect to the sup-norm).Since we are working with the sup-norm,[tex]|| · ||[infinity],[/tex] then we have the following: Suppose that B is not bounded. Then, for each integer n ≥ 1, there exists [tex]fₙ ∈ B[/tex] such that[tex]||fₙ||[infinity] > n[/tex]. In particular, for each n ≥ 1, there exists[tex]xₙ ∈ [0, 1][/tex] such that [tex]|fₙ(xₙ)| > n[/tex]. Define [tex]gₙ(x) = fₙ(x)/n[/tex]. Then [tex]gₙ ∈ B, but ||gₙ||[infinity] > 1,[/tex] which contradicts the definition of B. Hence, B is bounded. Let {fₙ} be a sequence of functions in B that converges to f ∈ C([0, 1]). We need to show that f ∈ B. Since {fₙ} converges to f uniformly on [0, 1], it follows that f is continuous.
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A teacher grades an exam and then applies a curve. The function shown below gives the relationship between the uncurved grade (U) and the curved grade (C) Answer parts (a) through (c). C(U)=U+15 a. Find the inverse function of C(U)=U+ 15. What does it represent? Choose the correct inverse function shown below. OA. U(C)=15+C OB. U(C)=C+15 OC. U(C) =15-C OD. U(C)=C-15
The inverse function of C(U) = U + 15 is U(C) = C - 15, representing the uncurved grade in terms of the curved grade. The correct option is OD. U(C) = C - 15.
To find the inverse function of C(U) = U + 15, we need to switch the roles of U and C and solve for U.
Let's denote the inverse function as U(C).
C = U + 15
To find U, we subtract 15 from both sides:
C - 15 = U
Therefore, the inverse function is U(C) = C - 15.
Among the given options, the correct inverse function is OD. U(C) = C - 15.
This inverse function represents the uncurved grade (U) in terms of the curved grade (C). It allows us to determine the original uncurved grade when we know the curved grade after applying a curve of adding 15.
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Please help due mon and would love to have this turned in sooner becuase then i will be able to have time to do my other assignments
Answer:
There are a total of 10 + 15 + 25 = 50 marbles in the bag, and 10 of them are red. Therefore, the probability of Tammy selecting a red marble on any given draw is 10/50 = 1/5.
Since Tammy is returning the marble to the bag after each draw, the probability of selecting a red marble on any given draw remains the same. This means that each of the 90 draws is an independent event with a probability of 1/5 of selecting a red marble.
To find the expected number of times Tammy will select a red marble in 90 draws, we can use the formula:
Expected number of red marbles = Total number of draws x Probability of selecting a red marble on any given draw
Expected number of red marbles = 90 x 1/5
Expected number of red marbles = 18
Therefore, Tammy can expect to pull out a red marble approximately 18 times in 90 draws.
This shows a figure. What is the measure of angle MRX?
The measurement of the angle MRX is 130°.
Given that a figure we need to find the angle MRX,
The lines TP and ZX are perpendicular to each other, and there is a line MQ intersecting at R,
So,
Angles MRT and MRZ are complementary so,
m ∠MRZ + m ∠MRT = 90°
50° + m ∠MRT = 90°
m ∠MRT = 40°
Also,
Angles TRX and TRZ are supplementary so, and equal to right angle, so,
m ∠MRX = m ∠MRT + m ∠TRX
m ∠MRX = 90° + 40°
m ∠MRX = 130°
Hence the measurement of the angle MRX is 130°.
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Timothy creates a game in which the player rolls 4 dice. What is the probability in
this game of having exactly 3 dice land on a 1?
Round to 3 decimal places
the first probability of having a dice land on 1 is 1 in 6 or 1/6. to find the probability of it happening 3 times we do (1/6)^3. (1/6)^3 is 1/216. but since it said exactly 3 doce landing on 1 we need to make sure the ladt isnt a 1 and the probability of that happening is 5/6. so to find the total probability of exactly 3 doce being 1 we do (1/216)*(5/6)=5/1296 or when rounded to 3 decimal places its 0.004. also pls mark as brainliest answer
Brainliest to the Correct! answer only
Write a function rule for “The output is 5 less than the input.” Let x
be the input and let y
be the output.
y= ?
Answer:
y = x - 5
Step-by-step explanation:
x is input
y is output
output, y, is 5 less than input, x
y = x - 5
a low value of the correlation coefficient r implies that x and y are unrelated. a. true b. false
The statement "A low value of the correlation coefficient r implies that x and y are unrelated" is false.
In the context of correlation coefficient (r), the value of r measures the strength and direction of the linear relationship between two variables, x and y. It ranges from -1 to +1, where -1 indicates a perfect negative linear relationship, +1 indicates a perfect positive linear relationship, and 0 indicates no linear relationship.
A low value of the correlation coefficient (close to 0) does not necessarily imply that x and y are unrelated. It only suggests that there is a weak linear relationship between the variables. However, it is important to note that there could still be other types of relationships or associations between the variables that are not captured by the correlation coefficient.
Therefore, a low value of the correlation coefficient does not provide definitive evidence that x and y are unrelated. It is necessary to consider other factors, such as the nature of the data, the context of the variables, and potential nonlinear relationships, before concluding whether x and y are truly unrelated.
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John deposited $4000 into an account with 4.9%intrest, compounded quarterly. Asuuming that no wuthdrawls are nade mow much will he have in the account after 8 years
≈$5,905.67
Total Interest: $1,905.67
[tex]A=P(1+\frac{r}{n} )^{nt}[/tex] where:
[tex]A[/tex] = final amount,
[tex]P[/tex] = initial principal: 4000 ,
[tex]r[/tex] = interest rate: 4.9%,
[tex]n[/tex] = number of times interest applied per time period: quarterly; 4
and [tex]t[/tex] = time: in years; 8
thus:
[tex]A=4000(1+\frac{0.049}{4} )^{32}[/tex]
Danielle is reviewing two different savings accounts. Use the features of each account provided in the table to complete the statement.
Interest Rate Compounding Frequency Minimum Deposit
Savings Account 1 2. 25% semiannually $500
Savings Account 2 2. 20% quarterly $500
We can see that Savings Account 1 offers a slightly higher interest rate but compounds less frequently compared to Savings Account 2. The choice between the two accounts would depend on an individual's preferences and financial goals.
Based on the information provided in the table, we can complete the statement as follows:
"Savings Account 1 offers an interest rate of 2.25% compounded semiannually, with a minimum deposit requirement of $500. On the other hand, Savings Account 2 offers an interest rate of 2.20% compounded quarterly, also requiring a minimum deposit of $500."
The interest rate represents the annual percentage rate (APR) that the account offers. For Savings Account 1, the interest rate is 2.25%, meaning that for every $100 in the account, it will earn $2.25 in interest over the course of a year. This interest is compounded semiannually, meaning it is added to the account balance twice a year.
In contrast, Savings Account 2 offers an interest rate of 2.20%, slightly lower than the first account. However, the interest is compounded more frequently, on a quarterly basis. This means that the interest is added to the account balance four times a year.
Both accounts have the same minimum deposit requirement of $500, indicating that to open either account, a minimum of $500 must be deposited.
Overall, when comparing the two accounts, we can see that Savings Account 1 offers a slightly higher interest rate but compounds less frequently compared to Savings Account 2. The choice between the two accounts would depend on an individual's preferences and financial goals.
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Find all solutions of the equation x2-2x+8=0 and express them in the form a+bi
Answer: [tex]-1 +\sqrt{7} i[/tex] and [tex]-1 -\sqrt{7} i[/tex]
Step-by-step explanation:
[tex]x^2 + 2x +8 = 0[/tex]
We cant factor. so use the quadratic formula and get:
[tex]x = \frac{-2 + \sqrt{-28} }{2}[/tex] and [tex]x = \frac{-2 - \sqrt{-28} }{2}[/tex]
these can be simplified to:
[tex]-1 +\sqrt{7} i[/tex] and [tex]-1 -\sqrt{7} i[/tex]
and thats it!
12) 75a²c-45a³d-30bc + 18bd 14) 90au - 36av- 150 yu + 60 yv
16) 105ab-90a-21b+18
18) 150m²nz +20mn²c-120m²nc-25mn²z
The given expressions are algebraic equations consisting of variables and coefficients. They involve various combinations of addition and subtraction of terms.
The expressions can be simplified by combining like terms, which involves adding or subtracting coefficients that have the same variables and exponents. The simplified forms of the expressions are as follows:
-45a³d + 75a²c - 30bc + 18bd
-150yu + 90au - 36av + 60yv
-90a + 105ab - 21b + 18
150m²nz - 120m²nc + 20mn²c - 25mn²z
12) The expression 75a²c - 45a³d - 30bc + 18bd can be rearranged by combining like terms: -45a³d + 75a²c - 30bc + 18bd.
The expression 90au - 36av - 150yu + 60yv can be rearranged by combining like terms: -150yu + 90au - 36av + 60yv.
The expression 105ab - 90a - 21b + 18 can be rearranged by combining like terms: -90a + 105ab - 21b + 18.
The expression 150m²nz + 20mn²c - 120m²nc - 25mn²z can be rearranged by combining like terms: 150m²nz - 120m²nc + 20mn²c - 25mn²z.
In each case, the terms with the same variables and exponents are combined by either adding or subtracting their coefficients. The simplified forms of the expressions allow for easier manipulation and analysis of the given algebraic equations.
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Marissa purchased x dollars worth of stock and paid her broker a 0. 8% fee. She sold the stock when the stock price increased to $4,500 using an online broker that charged $20 per trade
Expression C (4,480 * 1.008x) cannot be used to determine Marissa's net proceeds because it does not consider the broker fee or the online broker fee, which should be deducted from the final proceeds.
Let's evaluate each expression to determine which one cannot be used to determine Marissa's net proceeds.
A. 4,500 * 1.008x - 20
This expression represents the final proceeds after deducting the broker fee of 0.8% (0.008) and the online broker fee of $20. It correctly calculates the net proceeds and can be used.
B. 4,500 - (0.08x + 20 + x)
This expression subtracts various fees (broker fee and online broker fee) and the initial investment amount from the final stock price. It correctly calculates the net proceeds and can be used.
C. 4,480 * 1.008x
This expression multiplies the stock price before deducting any fees by the investment amount. However, it does not account for the broker fee or the online broker fee, which should be subtracted from the final proceeds. Therefore, this expression cannot be used to determine Marissa's net proceeds.
D. 4,500 * (1.008x + 20)
This expression multiplies the stock price after deducting the online broker fee by the investment amount and the broker fee. It correctly calculates the net proceeds and can be used.
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Complete Question:
Marissa purchased x dollars worth of stock and paid her broker a 0.8% fee. She sold the stock when the stock price increased to $4,500 using an online broker that charged $20 per trade.
Which expression below cannot be used to determine her net proceeds?
A. 4,500 1.008x-20
B. 4,500-(0.08x+20+x)
C. 4,4801.008x
D. 4,500 (1.008x+20)
what is the difference between 17/100 x 20 and 17/20 x 100 in percentage
96% percentage is the difference between 17/100 x 20 and 17/20 x 100
The difference between (17/100) x 20 and (17/20) x 100 can be calculated by finding the absolute difference between the two values and expressing it as a percentage of the larger value.
First, let's calculate each expression:
(17/100) x 20 = 0.17 x 20 = 3.4
(17/20) x 100 = 0.85 x 100 = 85
The difference between these two values is |85 - 3.4| = 81.6.
To express this difference as a percentage of the larger value, we divide 81.6 by the larger value (85 in this case) and multiply by 100:
(81.6 / 85) x 100 = 96%
Therefore, the difference between (17/100) x 20 and (17/20) x 100 is approximately 96% of the larger value.
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According to a recent poll, 28% of adults in a certain area have high levels of cholesterol. They report that such elevated levels "could be financially devastating to the regions healthcare system" and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent studies, cholesterol levels in healthy adults from the area average about 208 mg/dL, with a standard deviation of about 35 mg/dL, and are roughly Normally distributed. If the cholesterol levels of a sample of 47 healthy adults from the region is taken, answer parts (a) through (d). a. What is the probability that the mean cholesterol level of the sample will be no more than 208?
b. What is the probability that the mean cholesterol level of the sample will be between 203 and 213
c. what is the probability that the mean cholesterol level of the sample will be less than 198?
d. what is the probability that mean cholesterol
(a) the probability of obtaining a mean cholesterol level no more than 208 mg/dL is 0.50 or 50%.
(b) the probability of the mean cholesterol level being between 203 and 213 mg/dL.
(c) The probability will give us the likelihood of obtaining a mean cholesterol level less than 198 mg/dL.
(d) the probability that the mean cholesterol level of the sample will be greater than 217 is 15.1%.
a. The probability that the mean cholesterol level of the sample will be no more than 208 mg/dL can be calculated using the z-score formula. First, we need to calculate the z-score for 208 mg/dL, which is (208 - 208) / (35 / √47) = 0. The z-score of 0 corresponds to the mean, and since the cholesterol levels are normally distributed, the probability of obtaining a mean cholesterol level no more than 208 mg/dL is 0.50 or 50%.
b. To calculate the probability that the mean cholesterol level of the sample will be between 203 and 213 mg/dL, we need to calculate the z-scores for both values. The z-score for 203 mg/dL is (203 - 208) / (35 / √47) ≈ -0.7143, and the z-score for 213 mg/dL is (213 - 208) / (35 / √47) ≈ 0.7143. Using a standard normal distribution table or calculator, we can find the probability associated with each z-score. Subtracting the probability associated with the lower z-score from the probability associated with the higher z-score gives us the probability of the mean cholesterol level being between 203 and 213 mg/dL.
c. To calculate the probability that the mean cholesterol level of the sample will be less than 198 mg/dL, we need to calculate the z-score for 198 mg/dL. The z-score is (198 - 208) / (35 / √47) ≈ -1.7143. Again, using a standard normal distribution table or calculator, we can find the probability associated with this z-score. The probability will give us the likelihood of obtaining a mean cholesterol level less than 198 mg/dL.
d. To find the probability that the mean cholesterol level of the sample will be greater than 217 mg/dL, we calculate the z-score for 217 mg/dL: (217 - 208) / (35 / √47) ≈ 1.03. Using the standard normal distribution table or calculator, we find the area to the right of this z-score, which corresponds to the probability. The probability is approximately 0.151 or 15.1%.
Complete Question:
According to a recent poll, 28% of adults in a certain area have high levels of cholesterol. They report that such elevated levels "could be financially devastating to the regions healthcare system" and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent studies, cholesterol levels in healthy adults from the area average about 208 mg/dL, with a standard deviation of about 35 mg/dL, and are roughly Normally distributed. If the cholesterol levels of a sample of 47 healthy adults from the region is taken, answer parts (a) through (d). a. What is the probability that the mean cholesterol level of the sample will be no more than 208?
b. What is the probability that the mean cholesterol level of the sample will be between 203 and 213
c. what is the probability that the mean cholesterol level of the sample will be less than 198?
(d) What is the probability that the mean cholesterol level of the sample will be greater than 217?
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x degree + x degree + 90 degree + x/2 degree = 360 degrees
WHAT IS THE VALUE OF X
The value of x in the equation x degree + x degrees + 90 degrees + x/2 degree = 360 degrees is 108.
In order to solve for x in the equation:
X degree + x degree + 90 degree + x/2 degree = 360 degrees
We can start by simplifying the equation:
X + x + 90 + x/2 = 360
Combining like terms:
3/2x + X + 90 = 360
Next, let's isolate the terms involving x on one side of the equation:
3/2x + x = 360 - 90
Simplifying:
5/2x = 270
To solve for x, we need to multiply both sides of the equation by 2/5:
(2/5)(5/2x) = (2/5)(270)
x = 540/5
x = 108
Therefore, the value of x in the equation x degree + x degrees + 90 degrees + x/2 degree = 360 degrees is 108.
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how many poker hands consist of all face cards? (there are 12 face cards per deck, 52 cards in total per deck, and a poker hand consists of 5 cards) combinations
There are 792 poker hands consisting of all face cards.
To determine the number of poker hands consisting of all face cards, we need to consider the number of ways we can select 5 face cards from the 12 available face cards.
Since we are selecting a specific number of items from a larger set without considering the order, we can use combinations to calculate the number of poker hands.
The number of combinations of selecting k items from a set of n items is given by the formula:
C(n, k) = n! / (k!(n-k)!)
In this case, we want to select 5 face cards from the set of 12 face cards, so we can calculate:
C(12, 5) = 12! / (5!(12-5)!)
C(12, 5) = 12! / (5! * 7!)
Calculating the factorial terms:
12! = 12 * 11 * 10 * 9 * 8 * 7!
5! = 5 * 4 * 3 * 2 * 1
7! = 7 * 6 * 5 * 4 * 3 * 2 * 1
Plugging in the values:
C(12, 5) = (12 * 11 * 10 * 9 * 8 * 7!) / (5 * 4 * 3 * 2 * 1 * 7!)
Simplifying the expression:
C(12, 5) = (12 * 11 * 10 * 9 * 8) / (5 * 4 * 3 * 2 * 1)
C(12, 5) = 792
Therefore, there are 792 poker hands consisting of all face cards.
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Suppose 60% of the area under the standard normal curve lies to the right of z. The value of z is greater than zero. Select one: O True False
Suppose 60% of the area under the standard normal curve lies to the right of z. The value of z is greater than zero. This statement is True.
We know that the standard normal distribution is symmetric.
So, if we divide the area of the curve into two parts, each part will have 50% area. The standard normal distribution is shown below : Now, it is given that 60% of the area under the standard normal curve lies to the right of z. This implies that the remaining 40% area lies to the left of z. Therefore, z is negative because it lies to the left of the mean.
However, it is given that the value of z is greater than zero. This is not possible.
Hence, the given statement is false. However, if the statement was changed to say that 60% of the area lies to the left of z, then the statement would be true. This is because z is a positive value and it lies to the left of the mean.
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Solve the following using a power series of the form y = ERCr&n+2. x?y" + xy' + (32 - 4)y=0)
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The solution is then[tex]: y(x) = a0 + a1x - 3a2x²/2! + ∑k=3∞akxk[/tex]For r = 1, the recurrence relation is:ak+2 = -ak/[(k+3)(k+2)]. The solution is then: y(x) = a0x + a1x²/2 - a3x4/4! + ∑k=4∞akxkThe solution obtained by both methods is of the form: y(x) = ERCrx.
The differential equation given is: x?y" + xy' + (32 - 4)y = 0Solve the following using a power series of the form y = ERCr&n+2.x.To solve this differential equation using the power series method, we will first assume the solution as a power series:y(x) = ERCrx = ∑n=0∞anxn+rAnd we differentiate it to get:y'(x) = ∑n=0∞an(n+r)xn+r-1y''(x) = ∑n=0∞an(n+r)(n+r-1)xn+r-2Now, we substitute the power series and its derivatives into the differential equation and collect the coefficients of the like terms.x?y" + xy' + (32 - 4)y = 0 x²∑n=0∞an(n+r)(n+r-1)xn+r-2+x∑n=0∞an(n+r)xn+r-1+(32-4)∑n=0∞anxn+r = 0xr-2∑n=0∞an(n+r)(n+r-1)xn+xr-1∑n=0∞an(n+r)xn+(32-4)∑n=0∞anxn+r = 0Now, we change the summation index by introducing a new variable k = n+r-2.
The new summation index starts from k = 0 when n = [tex]2-r.xr-2∑k=0∞ak-2+r(k+r)(k+r-1)xk+xr-1∑k=1∞ak-1+r(k+r-1)xk+(32-4)∑k=0∞ak+rxk+r = 0xr-2∑k=0∞ak+r\color{red}{-2+r}\normalsize(k+r)\color{red}{(k+r-1)}\normalsize xk+xr-1∑k=1∞ak\color{red}{-1+r}\normalsize(k+r-1)xk+(32-4)∑k=0∞ak+rxk+r = 0[/tex]Now, we have two summation terms that start from k = 0, which we will combine to get:[tex]xr-2[arr(r-1)x0 + ar+1(r+1)r x1 + ∑k=2∞ak+r\color{red}{-2+r}\normalsize(k+r)(k+r-1)xk] + xr-1[arr x0 + ∑k=1∞ak\color{red}{-1+r}\normalsize(k+r-1)xk] + (32-4)∑k=0∞ak+rxk+r = 0xr-2[arr(r-1)x0 + ar+1(r+1)r x1 + ∑k=2∞ak+r\color{red}{-2+r}\normalsize(k+r)(k+r-1)xk] + xr-1[arr x0 + ∑k=1∞ak\color{red}{-1+r}\normalsize(k+r-1)xk] + 28∑k=0∞ak+r\color{red}{+2}\normalsizexk+2 = 0[/tex]For the series to vanish for all x, the coefficient of each power of x must be zero. Hence, we get the following equations after equating the coefficients.[tex]arr(r-1) = 0ar+1(r+1)r = 0ak+r-2+r(k+r)(k+r-1) + ak-1+r(k+r-1) = 0 for k ≥ 2arr + ak-1+r(k+r-1) = 0 for k ≥ 1For the power series to converge, we must have ar ≠ 0[/tex]. From the first equation, we can have r = 0 or r = 1. For r = 0, the second equation implies a1 = 0. For r = 1, the second equation implies a2 = 0.Using the third and fourth equations, we can get the coefficients recursively. For r = 0, the recurrence relation is:ak+2 = -3ak/[(k+2)(k+1)]
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a 2.00 g sample of ice at 0.0o c is placed in a 50.0 g of water initially at 25.0 c in an insulated container
When the 2.00 g sample of ice at 0.0°C is placed in the 50.0 g of water initially at 25.0°C in an insulated container, heat transfer occurs between the ice and water until they reach thermal equilibrium.
The heat transfer process involves the ice absorbing heat energy from the water, causing the ice to melt and the water to cool down. This is due to the ice having a lower temperature than the water. During the heat transfer, the ice absorbs heat from the water, causing its temperature to rise and reach its melting point of 0.0°C. Once the ice has completely melted, the water and ice mixture will be at a uniform temperature of 0.0°C.
Since the container is insulated, it prevents any heat exchange with the surroundings, ensuring that the system remains closed and the heat transfer occurs only between the ice and water. Overall, the system reaches a final equilibrium state where all the ice has melted, and the final temperature of the water-ice mixture is 0.0°C.
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Proving explicit formulas for recurrence relations by induction. Prove each of the following statements using mathematical induction (b) Define the sequence {bn} as follows: • bo = 1 • bn = 2bn-1 + 1 for n21 Prove that for n 2 0, bn = 2n+1 -1.
By the principle of mathematical induction, we can conclude that for all n ≥ 0, bn = 2n+1 - 1.
To prove that for n ≥ 0, bn = 2n+1 - 1, we will use mathematical induction.
Base case: When n = 0, we have b0 = 1, and 2(0) + 1 - 1 = 0, which satisfies the given formula.
Induction hypothesis: Assume that for some integer k ≥ 0, we have bk = 2k+1 - 1.
Induction step: We will prove that if the induction hypothesis is true for k, then it is also true for k + 1. That is, we will show that bk+1 = 2(k+1)+1 - 1.
Using the recurrence relation given in the problem statement, we have:
bk+1 = 2bk + 1
= 2(2k+1 - 1) + 1 (by the induction hypothesis)
= 2(2k+1) - 1
= 2(k+1)+1 - 1
Therefore, we have shown that if the induction hypothesis is true for k, then it is also true for k + 1. By the principle of mathematical induction, we can conclude that for all n ≥ 0, bn = 2n+1 - 1.
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A bag contains eight yellow marbles, nine green marbles, three purple marbles, and five red marbles. Three marbles are randomly chosen from the bag. What is the probability that there is at most one purple marble? 0. 100 0. 301 0. 770 0. 971.
the probability that there is at most one purple marble when three marbles are randomly chosen from the bag is approximately 0.770.
To find the probability that there is at most one purple marble when three marbles are randomly chosen from the bag, we need to consider the different scenarios:
Scenario 1: No purple marbles are chosen
In this case, we can choose 3 marbles from the remaining yellow, green, and red marbles. The number of ways to choose 3 marbles from a set of 22 marbles (8 yellow + 9 green + 5 red) is given by the combination formula: C(22, 3).
Scenario 2: One purple marble is chosen
In this case, we need to choose 2 marbles from the remaining yellow, green, and red marbles, and 1 marble from the 3 purple marbles. The number of ways to choose 2 marbles from 22 marbles and 1 marble from 3 marbles is given by the combination formula: C(22, 2) * C(3, 1).
The total number of ways to choose 3 marbles from the 25 marbles in the bag (8 yellow + 9 green + 3 purple + 5 red) is given by: C(25, 3).
To find the probability, we sum the probabilities of both scenarios and divide by the total number of ways to choose 3 marbles:
Probability = (Number of ways for scenario 1 + Number of ways for scenario 2) / Total number of ways
Probability = (C(22, 3) + (C(22, 2) * C(3, 1))) / C(25, 3)
Using a calculator or computer program to calculate the combinations, we can find:
Probability ≈ 0.770
Therefore, the probability that there is at most one purple marble when three marbles are randomly chosen from the bag is approximately 0.770.
The correct answer is 0.770, corresponding to option 0.770.
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The equation for a circle is x2−8x+y2−2y−8=0 .
What is the equation of the circle in standard form?
Responses
(x−16)2+(y−1)2=25
open parenthesis x minus 16 close parenthesis squared plus open parenthesis y minus 1 close parenthesis squared equals 25
(x−4)2+(y−1)2=16
open parenthesis x minus 4 close parenthesis squared plus open parenthesis y minus 1 close parenthesis squared equals 16
(x−16)2+(y−1)2=16
open parenthesis x minus 16 close parentheses squared plus open parenthesis y minus 1 close parenthesis squared equals 16
(x−4)2+(y−1)2=25
The equation of this circle in standard form is: D. (x - 4)² + (y - 1)² = 25.
What is the equation of a circle?In Geometry, the standard form of the equation of a circle is modeled by this mathematical equation;
(x - h)² + (y - k)² = r²
Where:
h and k represent the coordinates at the center of a circle.r represent the radius of a circle.From the information provided above, we have the following equation of a circle:
x² - 8x + y² - 2y - 8 = 0
x² - 8x + y² - 2y = 8
x² - 8x + (-8/2)² + y² - 2y + (-2/2)² = 8 + (-8/2)² + (-2/2)²
x² - 8x + 16 + y² - 2y + 1 = 8 + 16 + 1
(x - 4)² + (y - 1)² = 25
(x - 4)² + (y - 1)² = 25
Therefore, the center (h, k) is (4, 1) and the radius is equal to 5 units.
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