a program exists to encourage more middle school students to major in math and science when they go to college. the organizers of the program want to estimate the proportion of students who, after completing the program, go on to major in math or science in college. the organizers will select a sample of students from a list of all students who completed the program. which of the following sampling methods describes a stratified random sample?

The probability of getting a fish taco (crunchy or soft) is 0.2.

Probability is identifiable as the measure of the probable likelihood or chance of a particular event manifesting itself. As a matter of mathematical fact, it serves to quantitatively assess and analyze uncertainty in occurrences ranging from gambling and random contests to atmospheric predictions and scientific breakthroughs.

Since there are 20 taco fish out of 100. The probability of getting a fish taco (crunchy or soft) is:

= 20 / 100

= 0.2.

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There are 20 taco fish out of 100. What is the probability of getting a fish taco (crunchy or soft) is 0.2.

The graph of the system of inequalities is the one in the bottom left corner.

Here we have the following system of inequalities:

y ≤ 2x+1

y > −2x−3

The first inequality has the symbol "≤", then the liine should be a solid line, and we need to have the region below the line shaded. Also notice that this line has a positive slope, so it goes up.

The second line has the symbol ">", so here we have a dashed line and the region shaded must be above the line, this line has a negative slope.

Then the graph of the system of inequalities is the one in the bottom left.

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For the first question, the appropriate statistical test to use when comparing the mean GPA of psychology majors to the average mean GPA of all Bradley University students is the single-sample t-test (option b). This test is used when comparing a sample mean to a known population mean with an unknown population standard deviation.

For the second question, if Dr. Harris' failure to reject the null hypothesis is due to the true presence of an effect (i.e., craving does enhance attentional capture), it represents a false negative (option c). This occurs when a study fails to detect a true effect, leading to the incorrect retention of the null hypothesis.

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The statements that are true are:

m∠5 + m∠6  = 180°

m∠2 + m∠3 = m∠6

m∠2 + m∠3 + m∠5 = 180°

Options C, D, and E are the correct answer.

We have,

The sum of the three angles in a triangle is 180.

Exterior Angle Theorem.

The exterior angle in a triangle is equal to the sum of the two interior angles that are not adjacent to it.

From the figure,

∠2 + ∠3 + ∠5 = 180 ( sum of the angles in a triangle )

∠6 = ∠2 + ∠3 ( exterior angles definition )

∠4 = ∠2 + ∠5 ( exterior angles definition )

∠5 + ∠6 = 180 { straight angle )

Thus,

The statements that are true are:

m∠5 + m∠6  = 180°

m∠2 + m∠3 = m∠6

m∠2 + m∠3 + m∠5 = 180°

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To prove P(n) by induction for all integers n > 2:

Base case:
When n = 3, we have 23(3)-1 = 7, which is clearly divisible by 7. Thus, P(3) is true.

Inductive step:
Assume P(k) is true for some induction integer k > 2, i.e. 23k-1 is divisible by 7.
Now, we need to prove that P(k+1) is also true, i.e. 23(k+1)-1 is divisible by 7.

We know that 23(k+1)-1 = 2(23k-1) + 7. Since 23k-1 is divisible by 7 (by the assumption), we can express it as 23k-1 = 7m for some integer m.
Substituting this in the above equation, we get:
23(k+1)-1 = 2(7m) + 7 = 7(2m+1)

Since 2m+1 is an integer, we see that 23(k+1)-1 is also divisible by 7. Therefore, P(k+1) is true.

By the principle of mathematical induction, we have proved that P(n) is true for all integers n > 2.

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Answer:

There are 4 terms

Step-by-step explanation:

“Terms are single numbers, variables, or the product of a number and variables. Examples of terms: 9 a 9a 9a. y y y.”

There were 5500 shipments of one book, 2500 shipments of two books, and 1500 shipments of three to five books.

Let's denote the number of shipments for one book, two books, and three to five books as x, y, and z respectively. Then we can set up a system of equations based on the given information:

x + 2y + 3z = total number of books shipped

4x + 6y + 7z = total shipping charges

We know that there were 6400 orders of five or fewer books, so we can set an upper bound on the total number of books shipped:

x + y + z <= 6400

We also know that the number of shipments with $7 charges was 1000 less than the number with $6 charges, so:

z = y - 1000

Now we can substitute the last equation into the first two equations to eliminate z:

x + 2y + 3(y - 1000) = total number of books shipped

4x + 6y + 7(y - 1000) = total shipping charges

Simplifying and rearranging:

x - y = 3000

3x - y = 16000

Solving this system of equations gives:

x = 5500

y = 2500

z = 1500

There were 1500 shipments of three to five books, 2500 of two books, and 5,500 of one book.

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To determine if the sequence {an} is a solution of the recurrence relation an = 8an-1 – 16an-2, we need to substitute the given values of an and check if the equation holds true.

a) If an = 1, then we have:

an = 1
an-1 = a0 (since we don't have any values before a0)
an-2 = a-1 (which is not defined since a-1 is outside the domain of the sequence)

Substituting these values in the recurrence relation, we get:

1 = 8a0 - 16a-1 (using a0 = a-1 = 0, since they are undefined)

Simplifying this equation, we get:

1 = 0, which is not true. Therefore, the sequence {an} is not a solution of the recurrence relation if an = 1.

b) If an = 4, then we have:

an = 4
an-1 = a3
an-2 = a2

Substituting these values in the recurrence relation, we get:

4 = 8a3 - 16a2

Simplifying this equation, we get:

2 = 4a3 - 8a2
1/2 = 2a3 - 4a2
1/8 = a3 - 2a2

Therefore, the sequence {an} is a solution of the recurrence relation if an = 4.

In summary, the sequence {an} is not a solution of the recurrence relation if an = 1, but it is a solution if an = 4. This is because the recurrence relation is not satisfied for an = 1, but it is satisfied for an = 4.

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The number of batches of lamps that should be manufactured annually is 10 batches per year.

To find the number of batches of lamps that should be manufactured annually, we need to consider the trade-off between setup costs and storage costs. Each time a batch of lamps is manufactured, there is a setup cost of $500. However, this setup cost can be spread across the number of lamps in the batch to reduce storage costs.

Let's assume that each batch contains x lamps. This means that there are 100,000/x batches per year. The setup cost for each batch is $500, so the total setup cost per year is:

$500 x (100,000/x) = $500,000/x

The storage cost for each lamp is $1 per year, so the total storage cost per year is:

$1 x 100,000 = $100,000

To minimize the total cost, we need to find the value of x that minimizes the sum of the setup cost and storage cost:

Total Cost = Setup Cost + Storage Cost

= $500,000/x + $100,000

To minimize this function, we can take its derivative with respect to x and set it equal to zero:

d(Total Cost)/dx = -500,000/x² = 0

x = √(500,000) = 707.11

However, since x must be a whole number, we round up to get x = 708.

Therefore, the number of batches of lamps that should be manufactured annually is 100,000/708 ≈ 141.24. However, since we can't manufacture a fraction of a batch, we round down to get the final answer of 10 batches per year.

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Complete Question:

Suppose 100,000 lamps are to be manufactured annually. It costs $1 to store a lamp for 1 year, and it costs $500 to set up the factory to produce a batch of lamps. Find the number of batches of lamps that should be manufactured annually.

....................................

The Confusion Matrix is so named :

because it captures metrics that show how the trained model may be confused in distinguishing between positive and negative classes of the output variable.

In the context of data mining, the Confusion Matrix helps to measure the performance of a classification algorithm. It displays the true positive, true negative, false positive, and false negative values, which provide insight into how well the model is performing and where it might be making errors.

The matrix presents a tabular representation of predicted and actual classification results, which can be used to evaluate the performance of a classification model. The confusion arises from the fact that the model may misclassify samples, leading to confusion about the true performance of the model. The Confusion Matrix provides a way to quantify and visualize this confusion, and is a useful tool for evaluating the accuracy of machine learning models.

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The value of z, In the above statistics-based question where the area to the right of z is 0.9803, is approximately 1.81.

In statistics, the standard normal distribution is a specific distribution of normal random variables with a mean of 0 and a standard deviation of 1. The area under the curve of a standard normal distribution is equal to 1, and the distribution is symmetric around the mean of 0.

To find the value of z for a given area to the right of z, we can use a standard normal distribution table or calculator. For example, using a standard normal distribution table, we can find the value of z that corresponds to an area of 0.0197 to the left of z. This value is approximately -1.81. Since the area to the right of z is 0.9803, we can find the value of z by subtracting -1.81 from 0, which gives us approximately 1.81.

Alternatively, we can use the inverse normal distribution function in Excel or another statistical software package to find the value of z directly. For example, the Excel function NORMSINV(0.9803) returns a value of approximately 1.81, which is the same as the value we obtained using the standard normal distribution table.

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Answer:

The correct answer is c.) 3/36.There are three favorable outcomes (2, 11, and 12) out of a total of 36 possible outcomes (assuming a fair six-sided number cube). Therefore, the probability of X being a 2, 11, or 12 is 3/36, which can be simplified to 1/12.

Step-by-step explanation:

The difference is: Marginal cost is the money paid for producing one more unit of a good. Marginal revenue is the money earned from selling one more unit of a good.

Marginal cost (MC) is the additional outlay expended by a producer when they fabricate and supply one supplementary unit of an item or service. It symbolizes the replace in total costs caused by producing one extra piece.

Marginal revenue (MR), on the other hand, is the supplementary turnover generated when an establishment deals one more piece of a good or service. It signifies the transformation in complete revenue attained from selling an supplemental product.

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The measure of angle KJL is determined as 58 ⁰.

The value of angle KML is 116 ⁰.

The measure of angle subtended by the KJL is calculated by applying the following formula.

Based on the angle of intersecting chord theorem, we will have the following equation.

m∠KJL = ¹/₂(KL )

m∠KJL  = ¹/₂ x 116

m∠KJL  = 58⁰

The value of angle KML is calculated as;

m∠KML = 2 m∠KJL (angle at center twice angle at circumference)

m∠KML = 116⁰

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The fixed cost per unit based on cost of the machine per part manufactured is $0.42 per unit. Option ( A )

Multiplication is a mathematical operation that involves finding the product of two or more numbers or quantities. It is a way of adding a number to itself multiple times. The symbol used to represent multiplication is an "x" or a dot "·". For example, in the expression 5 x 6 = 30, 5 and 6 are multiplied together to give the product of 30. Multiplication can also be represented using parentheses, such as (5)(6) = 30. In addition, multiplication can be done with decimals, fractions, variables, and matrices.

To find the fixed cost per unit based on the cost of the machine per part manufactured, we need to calculate the total number of units produced by the machine over its estimated useful life, and then divide the cost of the machine by that number.

The machine runs at its capacity of 1,000 units per month for 10 years, so the total number of units produced by the machine is:

10 years x 12 months/year x 1,000 units/month = 120,000 units

The cost of the machine is $50,000, so the fixed cost per unit based on the cost of the machine per part manufactured is:

$50,000 ÷ 120,000 units = $0.4167 per unit

Rounding this to the nearest penny gives us the final answer of:

$0.42 per unit (option a)

Therefore, the fixed cost per unit based on cost of the machine per part manufactured is $0.42 per unit.

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We do not have enough evidence to reject the null hypothesis at the 5% significance level.

To generate a randomization distribution and calculate the p-value for this problem, we can use StatKey and select "Test for a Single Proportion" under the "Randomization Test" section. We then enter the sample information by clicking "Edit Data" and inputting p^=0.38 and n=100. The null hypothesis is that the population proportion is equal to 0.5, while the alternative hypothesis is that the population proportion is less than 0.5. Our sample result is p^=0.38. Using StatKey, we can generate a randomization distribution by clicking "Simulate" and then "Randomize".

We can then calculate the p-value by finding the proportion of randomization samples that have a proportion less than or equal to our sample proportion of 0.38. After running the simulation, we obtain a p-value of 0.168. Rounding to three decimal places, the p-value is 0.168.

Therefore, we do not have enough evidence to reject the null hypothesis at the 5% significance level.

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If B is row-equivalent to a nonsingular matrix A, then B is also nonsingular.

Suppose that A is a nonsingular matrix, which means that A has an inverse denoted by A[tex]^{-1}.[/tex]

Now let B be a matrix that is row-equivalent to A. This means that we can obtain B from A by applying a finite sequence of elementary row operations.

Since elementary row operations do not change the row space of a matrix, the row space of B is the same as the row space of A. This means that B has the same rank as A.

Since A is nonsingular, it has full rank (i.e., rank(A) = n, where n is the number of rows or columns in A). Therefore, B also has full rank, which means that B is also a nonsingular matrix.

To see this more explicitly, suppose that B is singular, which means that there exists a non-zero vector x such that Bx = 0.

Since B is row-equivalent to A, we have that Ax = 0 (since the row space of B is the same as the row space of A).

But this contradicts the fact that A is nonsingular, since if Ax = 0 then x = [tex]A^{-1}Ax = A^{-1}0 = 0.[/tex]

Therefore, B cannot be singular and must be nonsingular.

In summary, if B is row-equivalent to a nonsingular matrix A, then B is N also nonsingular.

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The velocity v in terms of t is: v = [tex]20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + 923[/tex]

The position s in terms of t is: s = [tex]40t^{ \frac{5}{2} } /5 - 24t^{\frac{2}{3} } /3 + 923t - 949[/tex]

To find the velocity and position functions given the acceleration and initial conditions.

Use the fact that acceleration is the second derivative of position with respect to time and that velocity is the first derivative of position with respect to time, to perform the integrations.

We also used the initial conditions given for velocity and position at a specific time to solve for the constants of integration.

Here we have

Partice moves on a coordinate line with acceleration d²s/dx² = 30√t- 6/√t subject to the conditions that ds/dt = 911 and s = 14 when t = 1.  

To find the velocity, integrate the acceleration with respect to t once:

=> d²s/dx² = 30√t- 6/√t

=> ds/dt = ∫(d²s/dx²)dt

= ∫(30√t- 6/√t)dt

= [tex]20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + C[/tex]

Using the initial condition ds/dt = 911 when t = 1, we can solve for C:

=> ds/dt = [tex]20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + C[/tex]

=> 911 =  [tex]20(1)^{ \frac{3}{2} } - 12(1)^{\frac{1}{2} } + C[/tex]

=> C = 923

Therefore, the velocity v in terms of t is:

=> v = [tex]20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + 923[/tex]

To find the position, we can integrate the velocity with respect to t once:

=> ds/dt = [tex]20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + 923[/tex]

=> s = ∫(ds/dt)dt = [tex]\int\limits } \, 20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + 923[/tex]

=> s = [tex]40t^{ \frac{5}{2} } /5 - 24t^{\frac{2}{3} } /3 + 923t + C'[/tex]  

Using the initial condition s = 14 when t = 1, we can solve for C':

=> 14 = [tex]40 (1)^{ \frac{5}{2} } /5 - 24(1)^{\frac{2}{3} } /3 + 923t + C'[/tex]

=> C' = -949

Therefore,

The velocity v in terms of t is: v = [tex]20t^{ \frac{3}{2} } - 12t^{\frac{1}{2} } + 923[/tex]

The position s in terms of t is: s = [tex]40t^{ \frac{5}{2} } /5 - 24t^{\frac{2}{3} } /3 + 923t - 949[/tex]

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Answer:

b = 12 Km

Step-by-step explanation:

using Pythagoras' identity in the right triangle

the square on the hypotenuse is equal to the sum of the squares on the other 2 sides , that is

b² + 16² = 20²

b² + 256 = 400 ( subtract 256 from both sides )

b² = 144 ( take square root of both sides )

b = [tex]\sqrt{144}[/tex] = 12

Mr. Di IORIO will save $40022.4 in total interest charges if he decides to amortize his mortgage over 20 years instead of 25 years.

Total interest charges = (Monthly payment x Total number of payments) - Principal

We can use a mortgage calculator or a formula to calculate the monthly payment for a $600,000 mortgage with a 3.59% interest rate amortized over 25 years. Using the formula:

Monthly payment = [tex](P\times r) / (1 - (1 + r)^{(-n)})[/tex]

where P is the principal ($600,000), r is the monthly interest rate (0.0359 / 12), and n is the total number of payments (25 years x 12 months per year = 300 payments).

Plugging in the values, we get:

Monthly payment = (600000 x 0.00299) / (1 - (1 + 0.00299)^(-300))

≈ $3032

Using this monthly payment, we can calculate the total interest charges for the 25-year mortgage:

Total interest charges = (3032 x 300) - 600000

= $309600

Now let's calculate the total interest charges for a 20-year mortgage. Using the same formula as above, but with n = 20 years x 12 months per year = 240 payments, we get:

Monthly payment = (600000 x 0.0033) / (1 - (1 + 0.0033)^(-240))

≈ $3623.24

Using this monthly payment, we can calculate the total interest charges for the 20-year mortgage:

Total interest charges = (3623.24 x 240) - 600000

= $269577.6

The difference in total interest charges between the 25-year and 20-year mortgages is:

Total interest charges (25 years) - Total interest charges (20 years)

= $309600 - $269577.6

= $40022.4

Therefore, Mr. Di IORIO will save $40022.4 in total interest charges if he decides to amortize his mortgage over 20 years instead of 25 years.

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I will pick 8th grade for this analysis, so I will look at the CCSSM for grades 7, 8, and 9.

For 7th grade:
1. 7.NS.A.1 (A): I have a strong understanding of applying operations with rational numbers, as I learned this in various math classes.
2. 7.RP.A.2 (B): I am familiar with proportional relationships, but I may need to review some specific examples to strengthen my understanding.

For 8th grade:
1. 8.EE.A.1 (A): I have a deep understanding of working with exponents, as it was a significant topic in my algebra classes.
2. 8.G.B.6 (B): I am familiar with the Pythagorean Theorem, but I may need to review some specific examples to solidify my knowledge.

For 9th grade (Algebra 1):
1. A.REI.B.3 (A): I am confident in solving linear equations, as this was a core topic in my algebra and calculus classes.
2. A.CED.A.2 (C): I understand creating equations in two variables, but I would need to review examples to ensure I fully grasp this standard.

For every standard that isn't an A or a B, I would look for examples and resources to help me better understand the concepts. For instance, for A.CED.A.2, I could find example problems involving creating and solving equations in two variables, which would help me improve my understanding of this standard.

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The length of the major arc DFE is 10.11 π ft.

Given that, a circle C, with central angle 100°, and radius 7 yards,

We need to find the length of the major arc DFE,

The length of an arc = central angle / 360° × circumference

The central angle for the arc DFE = 360° - 100° = 260°

So, the length = 260° / 360° × π × 14

= 10.11 π ft

Hence, the length of the major arc DFE is 10.11 π ft.

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We need to find the inverse of the function f(x) = 1/x. Therefore, h'(3) = -1/[tex]3^2[/tex] = -1/9. So, h'(3) = -1/9.

In the equation expressing the function, swap out f(x) with y. Swap out x and y. To put it another way, swap out every x for a y and vice versa.

An inverse in mathematics is a function that is used to another function.

Calculate y using a solution.

To find the inverse, we switch the x and y variables and solve for y:

x = 1/y

y = 1/x

So the inverse function of f(x) = 1/x is h(x) = 1/x.

Now, we need to find h'(3), the derivative of h(x) at x = 3.

h(x) = 1/x, so using the power rule of differentiation, we get:

h'(x) = -1/[tex]x^2[/tex]

Therefore, h'(3) = -[tex]1/3^2[/tex] = -1/9.

So, h'(3) = -1/9.

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Correct Question:

If h is the inverse function of f and if f(x) = 1/x, then h'(3) =

The values in the expression will be:

a. 4x

b. -4x

c. -16x

d. 4x + 5

e. 4x

f. 5x

g. 10 - 6x

h. 2x - 10

It is important to note that an expression is simply used to show the relationship between the variables that are provided or the data given regarding an information.

Based on the information, it should be noted that:

10x - 6x

= 4x

6x - 4x

= 2x

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The volatility of the stock market, according to the given model, will exceed 40% in 4.19 days.

Using the given model P(X> x) = Cx-a and assuming [a] = 3.3, we can solve for C by using the fact that on 40 days the volatility is larger than 15% in a given year:

P(X > 0.15) = C(0.15)-3.3 = 40/365
C = (40/365)/(0.15)-3.3 = 0.2702

Now we can solve for the probability of the volatility exceeding 40% in a given year:

P(X > 0.4) = 0.2702(0.4)-3.3 = 0.0005

To find the expected number of days with volatility exceeding 40%, we multiply this probability by the number of trading days in a year (assume 252 trading days):

Expected number of days = 0.0005 * 252 = 0.126

Rounding to the nearest whole number, we get:

b. On 4.19 days

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To use the shell method to find the volume of the solid generated by revolving the region bounded by the line y = 2x+3 and the parabola y=x^2, we need to first determine the limits of integration. Since we are revolving the region about different lines, the limits of integration will change based on the line of revolution.

a. To revolve about the line x=3, we need to find the distance between the line and the parabola. Setting the two equations equal to each other, we get x^2 = 2x+3, which gives us x= -1 and x=3. Therefore, our limits of integration will be from -1 to 3.

Next, we need to set up the integral using the shell method. We will be integrating with respect to x, so the height of our shell will be the difference between the two equations at a given x-value. This gives us the equation h(x) = (2x+3) - x^2.

The radius of our shell will be the distance from the line of revolution (x=3) to the point on the curve at a given x-value. Therefore, our radius will be r(x) = 3-x.

The volume of the solid can be found by integrating 2πrh(x) dx from -1 to 3. This gives us:

V = 2π ∫(-1 to 3) [(3-x)(2x+3-x^2)] dx

b. To revolve about the line x=-1, we again need to find the distance between the line and the parabola. Setting the two equations equal to each other, we get x^2 = 2x+3, which gives us x= -1 and x=3. Therefore, our limits of integration will be from -1 to 3.

Using the same formulas for h(x) and r(x), the volume of the solid can be found by integrating 2πrh(x) dx from -1 to 3. This gives us:

V = 2π ∫(-1 to 3) [(1+x)(2x+3-x^2)] dx

c. To revolve about the x-axis, we need to solve for the x-intercepts of the two equations. This gives us x=0 and x=2. Therefore, our limits of integration will be from 0 to 2.

Using the same formulas for h(x) and r(x), the volume of the solid can be found by integrating 2πrh(x) dx from 0 to 2. This gives us:

V = 2π ∫(0 to 2) [x(2x+3-x^2)] dx

d. To revolve about the line y=9, we need to shift both equations up by 9 units. This gives us the equations y = x^2 + 9 and y = 2x + 12. Setting the two equations equal to each other, we get x^2 - 2x - 3 = 0, which gives us x= -1 and x=3. Therefore, our limits of integration will be from -1 to 3.

Using the same formulas for h(x) and r(x), the volume of the solid can be found by integrating 2πrh(x) dx from -1 to 3. This gives us:

V = 2π ∫(-1 to 3) [(9-x^2)(2x+12-9)] dx

Overall, the shell method allows us to find the volume of the solid generated by revolving a region about a line. By setting up the integral with the correct limits of integration and formulas for h(x) and r(x), we can find the volume of the solid for each line of revolution.

a. To find the volume of the solid generated by revolving the region bounded by y = 2x + 3 and y = x^2 about the line x = 3, use the shell method with the formula: V = 2π ∫[R(x)h(x)dx], where R(x) is the radius and h(x) is the height of the cylindrical shell.

Here, R(x) = 3 - x and h(x) = (2x + 3) - x^2. Integrate from the intersection points of the two functions, which are x = 1 and x = 3:

V = 2π ∫[R(x)h(x)dx] = 2π ∫[(3-x)((2x+3)-x^2)dx] from 1 to 3
Evaluate the integral to get the volume.

b. For revolving around the line x = -1, R(x) = x + 1 and h(x) remains the same:

V = 2π ∫[(x+1)((2x+3)-x^2)dx] from 1 to 3
Evaluate the integral to get the volume.

c. For revolving around the x-axis, change the method to disks. The radius is now y, and the height is the difference in x values:

V = π ∫[(3-x)^2 dy] from y = 1 to y = 9

Evaluate the integral to get the volume.

d. For revolving around the line y = 9, R(y) = 9 - y and h(y) is the difference in x values:

V = 2π ∫[R(y)h(y)dy] = 2π ∫[(9-y)(3-x)dy] from y = 1 to y = 9
Evaluate the integral to get the volume.

In each case, evaluate the integrals to find the volume of the solid generated by revolving the region around the specified line.

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The probability of rolling a sum of 3 these dice is 1/18.

Given that, a pair of standard dice are rolled.

There are six different possible outcomes for a dice, the set (S) of all the outcomes can be listed as follows:

(1,1) (1,2) (1,3) (1,4) (1,5) (1,6)

(2,1) (2,2) (2,3) (2,4) (2,5) (2,6)

(3,1) (3,2) (3,3) (3,4) (3,5) (3,6)

(4,1) (4,2) (4,3) (4,4) (4,5) (4,6)

(5,1) (5,2) (5,3) (5,4) (5,5) (5,6)

(6,1) (6,2) (6,3) (6,4) (6,5) (6,6)

We know that, probability of an event = Number of favorable outcomes/Total number of outcomes.

Number of favorable outcomes = 2

Total number of outcomes = 36

Here, probability = 2/36

= 1/18

Therefore, the probability of rolling a sum of 3 these dice is 1/18.

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Answer:

B: 4.5

Step-by-step explanation:

10% of US adults sleep more than 7.9 hours per day .

We need to calculate the z-score for your sleep amount and find the area to the right of that z-score. z = (x - μ) / σ = (x - 6.5) / 1.25. Let's assume you got 7 hours of sleep. z = (7 - 6.5) / 1.25 = 0.4. Using a standard normal table or calculator, we find that the probability of a randomly selected US adult sleeping more than you did last night is 0.3446 (or 34.46%).

We need to calculate the z-score for your friend's sleep amount and find the area to the left of that z-score. z = (x - μ) / σ = (7.25 - 6.5) / 1.25 = 0.6. Using a standard normal table or calculator, we find that the probability of a randomly selected US adult sleeping less than your friend or family member did last night is 0.2743 (or 27.43%).

We need to calculate the z-score for 8 hours of sleep and find the area to the left of that z-score. z = (8 - 6.5) / 1.25 = 1.2. Using a standard normal table or calculator, we find that the percentage of US adults sleeping less than 8 hours per day is 0.1151 (or 11.51%).

We need to calculate the z-score for 4 hours of sleep and find the area to the left of that z-score. z = (4 - 6.5) / 1.25 = -2.0. Using a standard normal table or calculator, we find that the probability of a US adult sleeping less than 4 hours per day is 0.0228 (or 2.28%). This is a very low probability, so we can say that sleeping less than 4 hours per day is unusual.

We need to find the z-score that corresponds to the top 10% of the distribution. Using a standard normal table or calculator, we find that the z-score is approximately 1.28. Then, we can solve for x: z = (x - μ) / σ -> 1.28 = (x - 6.5) / 1.25 -> x = 7.9 hours. So, 10% of US adults sleep more than 7.9 hours per day.

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