Assume that adults have IQ scores that are normally distributed with a mean of 101.1 and a standard deviation of 17. Find the probability that a randomly selected adult has an IQ greater than 134.4
The probability that a randomly selected adult from this group has an IQ greater than 134.4 is ?

The 22nd term of the arithmetic sequence is 59.

We have,

2nd term of Arithmetic sequence= 9

and, 8th term = 24

So, a + d = 9....(1)

a+ 7d = 24...........(2)

Solving equation (1) and (2) we get

7d - d = 24 - 9

6d = 15

d = 5/2

and, a = 9 - 5/2 = 13/2

Now, the 22nd term of the sequence

= a + 21d

= 13/2 + 21(5/2)

= 13/2 + 105/2

= 118 /2

= 59

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0 (to four decimal places).

To find the probability that p is less than 0.9, we need to use the normal approximation to the binomial distribution, as n is large (n=255) and p is not too close to 0 or 1 (p=0.83).

The mean of the binomial distribution is given by μ = np = 255 × 0.83 = 211.65, and the standard deviation is given by σ = sqrt(np(1-p)) = sqrt(255 × 0.83 × 0.17) = 4.46 (rounded to two decimal places).

To use the normal distribution, we standardize the variable p using the formula z = (p - μ) / σ. Then, we find the probability that z is less than (0.9 - μ) / σ.

z = (0.9 - 211.65) / 4.46 = -35.43 (rounded to two decimal places)

Using a standard normal table or calculator, we find that the probability of a standard normal random variable being less than -35.43 is essentially 0 (to four decimal places). Therefore, the probability that p is less than 0.9 is also essentially 0 (to four decimal places).

Answer: 0 (to four decimal places).

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The value of surface area is,

SA = 570 cm²

Given that;

Base of house = 6 cm

And, Height of house = 19 cm

Since, The shape of house is like a prism.

We know that;

Area of Prism is,

SA = 2B + ph,

where B, stands for the area of the base, p represents the perimeter of the base, and h stands for the height of the prism.

Hence, We get;

SA = 2 × (1/2 x 6 × 19) + 2 (6 + 6) × 19

SA = 114 + 456

SA = 570 cm²

Hence, The value of surface area is,

SA = 570 cm²

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Therefore, the store with the lower sale price including sales tax is Pets Plus with a final price of $75.60.

Assume that the original price of the aquarium is $100. Then at Pets Plus, the sale price would be:

Sale price at Pets Plus = Original price - 30% of Original price

Sale price at Pets Plus = $100 - 0.3($100)

Sale price at Pets Plus = $70

And at Pet Planet, the sale price would be:

Sale price at Pet Planet = Original price - 25% of Original price

Sale price at Pet Planet = $100 - 0.25($100)

Sale price at Pet Planet = $75

Now, to calculate the final price including sales tax, we can use:

Final price = Sale price + (Sales tax rate x Sale price)

For Pets Plus:

Final price at Pets Plus = $70 + (0.08 x $70)

Final price at Pets Plus = $75.60

For Pet Planet:

Final price at Pet Planet = $75 + (0.08 x $75)

Final price at Pet Planet = $81

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Here are the scenarios and the appropriate statistical tests:

1. Testing whether the mean weight of a sample of 100 apples is equal to 0.5 pounds.

Answer: One-sample t-test. This is because the population standard deviation is unknown and we are using a sample to estimate it.

2. Comparing the mean exam scores of two different groups of students (e.g. males vs. females).

Answer: T-test for independent groups. This is because we are comparing the means of two different groups that are independent of each other.

3. Testing whether the mean height of a group of plants before and after being exposed to a certain type of fertilizer is significantly different.

Answer: T-test for dependent groups. This is because we are comparing the means of the same group before and after a treatment, and the data is paired.

4. Comparing the mean income levels of people from different regions (e.g. East Coast vs. West Coast vs. Midwest).

Answer: One-way analysis of variance (ANOVA). This is because we are comparing the means of more than two groups.

5. Testing whether the mean height of a group of people is equal to a specific value (e.g. 6 feet).

Answer: One-sample t-test. This is because we are testing whether the mean of a single group is equal to a specific value.

6. Testing whether the proportion of people who prefer Coke over Pepsi is significantly different from 50%.

Answer: One-sample z-test. This is because we are testing a proportion and we know the population standard deviation.

7. Comparing the mean scores of students who took a class with a certain teacher to the mean scores of students who took the same class with a different teacher.

T-test for independent groups. This is because we are comparing the means of two different groups that are independent of each other.

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Angle PBC is 126 degrees.

Let's start by drawing the triangle ABC and marking the point P on AC such that APB = ABP.

Since APB = ABP, we can conclude that the triangle ABP is an isosceles triangle, which means that angles ABP and BAP are equal.

Let's call angle ABP and angle BAP x, then we have:

angle ABC = 2x (since triangle ABP is isosceles)

angle ACB = 2x - 39 (from the given information)

Since the sum of angles in a triangle is 180 degrees, we can write:

angle PBC + angle ABC + angle ACB = 180

Substituting the values we found for angle ABC and angle ACB, we get:

angle PBC + 2x + (2x - 39) = 180

Simplifying the equation, we get:

angle PBC = 219 - 4x

We still need to find the value of x to calculate angle PBC. To do that, let's use the fact that the sum of angles in a triangle is 180 degrees for triangle ABP:

angle ABP + angle BAP + angle APB = 180

Substituting x for angle ABP and BAP, we get:

2x + angle APB = 180

But we also know that angle APB = ABP (from the given information), so we can substitute:

2x + ABP = 180

Solving for ABP, we get:

ABP = 90 - x

Now we can substitute this value for ABP in our equation for angle PBC:

angle PBC = 219 - 4x

= 219 - 4(90 - ABP)

= 219 - 4(90 - (90 - x))

= 219 - 4x

Simplifying, we get:

angle PBC = 3x - 9

So to find the value of angle PBC, we need to find the value of x:

2x + ABP = 180

2x + (90 - x) = 180

x = 45

Now we can substitute x = 45 in our equation for angle PBC:

angle PBC = 3x - 9

= 3(45) - 9

= 126

Therefore, angle PBC is 126 degrees.

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Full Question ;

Point P is on side AC of the triangle ABC such that APB = ABP and ABC - ACB = 39 find PBC in degrees.

To determine which subsets are subspaces of either r3 or p3, we need to check if they satisfy the three conditions for being a subspace:

1. Closure under addition: For any two vectors in the subset, their sum is also in the subset.
2. Closure under scalar multiplication: For any vector in the subset and any scalar, their product is also in the subset.
3. Contains the zero vector: The subset contains the vector of all zeros.

a) The set of all polynomials of degree exactly 3: This subset is a subspace of p3 because it satisfies all three conditions. The sum of two degree-3 polynomials is also a degree-3 polynomial, and a scalar multiple of a degree-3 polynomial is still a degree-3 polynomial. The zero polynomial is also a degree-3 polynomial.

b) The set of all vectors in r3 whose coordinates add up to 0: This subset is a subspace of r3 because it also satisfies all three conditions. The sum of two vectors whose coordinates add up to 0 also has coordinates that add up to 0, and a scalar multiple of such a vector also has coordinates that add up to 0. The zero vector is also in this subset.

c) The set of all polynomials in p3 whose constant term is 1: This subset is not a subspace of p3 because it does not satisfy the closure under addition condition. The sum of two polynomials with constant term 1 may not have a constant term of 1, so it is not closed under addition.

d) The set of all polynomials in p3 whose coefficient of the x^2 term is 0: This subset is a subspace of p3 because it satisfies all three conditions. The sum of two polynomials with a coefficient of 0 for x^2 also has a coefficient of 0 for x^2, and a scalar multiple of such a polynomial also has a coefficient of 0 for x^2. The zero polynomial is also in this subset.

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The negation of the statement without using any negation terms is: (∀x ∈ Z)(∃y ∈ Z)(xy ≤ y).

To find the negation of the statement (∃x ∈ Z)(∀y ∈ Z)(xy > y) without using any negation terms, we need to negate each part of the statement individually. Here's the step-by-step explanation:

Original statement: (∃x ∈ Z)(∀y ∈ Z)(xy > y)

1. Negate the existential quantifier (∃x ∈ Z): This changes to a universal quantifier (∀x ∈ Z).
2. Negate the universal quantifier (∀y ∈ Z): This changes to an existential quantifier (∃y ∈ Z).
3. Negate the inequality (xy > y): This changes to (xy ≤ y).

So the negation of the statement without using any negation terms is: (∀x ∈ Z)(∃y ∈ Z)(xy ≤ y).

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The 2-D shape used here is a right triangle. When rotated about the axis, this becomes a cone which is 3-D. See the attached.

In mathematics, rotation is a notion that originated in geometry. Any rotation is a movement of a specific space that retains at least one point.

A rotation differs from the following motions: translations, which have no fixed points, and (hyperplane) reflections, which each have a full (n 1)-dimensional flat of fixed points in an n-dimensional space.

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Answer: 50%

Step-by-step explanation:

For an even # to result, the fraction would be 3/6 or 1/2 which would become 0.5 or 50%.

(a) The probability of rolling a 3 is 1/6.

(b) The probability of rolling a 10 is 0 since a standard six-sided die only has numbers from 1 to 6.

(c) The probability of rolling an even number is 3/6 or 1/2. This is because there are three even numbers (2, 4, and 6) out of the six possible outcomes.

(a) The probability of rolling a 3 on a six-sided die is 1/6. There are 6 possible outcomes when rolling a die, and only 1 of those outcomes is a 3.

(b) The probability of rolling a 10 on a six-sided die is 0. There are no possible outcomes when rolling a die that will result in a 10.

(c) The probability of rolling an even number on a six-sided die is 1/2. There are 3 possible outcomes when rolling a die that will result in an even number: 2, 4, and 6.

Here are the answers in mathematical notation:

(a) P(3) = 1/6

(b) P(10) = 0

(c) P(even) = 1/2

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We have shown that (10101) times (10011) in GF(2^5) with [tex](x^5 + x^4 + x^3 + x^2+ 1)[/tex] as the modulus is equal to (101111) in binary or [tex]x^4 + x^2 + x + 1[/tex] in polynomial form.

To multiply (10101) by (10011) in GF [tex](2^5)[/tex] with [tex](x^5 + x^4 + x^3 + x^2+ 1)[/tex] as the modulus, we first need to write these polynomials as binary numbers:

[tex](10101) = 1x^4 + 0x^3 + 1x^2 + 0x + 1 = 16 + 4 + 1 = (21)_10 = (10101)_2[/tex]

[tex](10011) = 1x^4 + 0x^3 + 0x^2 + 1x + 1 = 16 + 2 + 1 = (19)_10 = (10011)_2[/tex]

We will use long multiplication to multiply these polynomials in GF[tex](2^5)[/tex], as shown below:

    1 0 1 0 1   <-- (10101)

  x 1 0 0 1 1   <-- (10011)

  ------------

    1 0 1 0 1   <-- Step 1: Multiply by 1

1 0 1 0 1      <-- Step 2: Multiply by x and shift left

------------

1 0 0 1 0 1    <-- Step 3: Add steps 1 and 2

1 0 0 1 0 <-- Step 4: Multiply by x and shift left

1 0 1 1 1 1 <-- Step 5: Add steps 3 and 4

Now, we have the product (101111)_2, which corresponds to the polynomial [tex]1x^4 + 0x^3 + 1x^2 + 1x + 1 = x^4 + x^2 + x + 1[/tex] in GF[tex](2^5)[/tex] with [tex](x^5 + x^4 + x^3 + x^2+ 1)[/tex] as the modulus. We can verify that this polynomial is indeed in GF(2^5) with modulus [tex](x^5 + x^4 + x^3 + x^2+ 1)[/tex] by noting that all of its coefficients are either 0 or 1, and none of its terms have degree greater than 4. Additionally, we can check that it satisfies the modulus:

[tex]x^4 + x^2 + x + 1 = (x^4 + x^3 + x^2 + x) + (x^3 + 1)[/tex]

[tex]= x(x^3 + x^2 + x + 1) + (x^3 + 1)[/tex]

[tex]= x(x^3 + x^2 + x + 1) + (x^3 + x^2 + x + 1)[/tex]

(since [tex]x^3 + x^2 + x + 1 = 0[/tex] in GF[tex](2^5))[/tex]

[tex]= (x+1)(x^3 + x^2 + x + 1)[/tex]

Therefore, we have shown that (10101) times (10011) in GF(2^5) with [tex](x^5 + x^4 + x^3 + x^2+ 1)[/tex] as the modulus is equal to (101111) in binary or [tex]x^4 + x^2 + x + 1[/tex] in polynomial form.

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The correct relationship is n² = 2n.

To finish the combinatorial argument by completing Method 2, we should consider the following:

Method 2:
1. As you mentioned, there are n ways for Arshpreet and Meixuan to choose the same flavor.
2. If they pick different flavors, there are a total of n*(n-1)/2 unique combinations, since this accounts for all the possible flavor pairings without double-counting.

Now, let's combine both parts of Method 2:
Total ways = Ways of choosing the same flavor + Ways of choosing different flavors
Total ways = n + n*(n-1)/2

Since both methods should result in the same number of total ways to order ice cream, we set Method 1 equal to Method 2:

n² = n + n*(n-1)/2

By solving this equation, we can verify if the given partial combinatorial argument holds true:

n² = n + n*(n-1)/2
2n² = 2n + n*(n-1)
2n² = 2n + n² - n
n² = 2n

This result shows that the given partial combinatorial argument (n² = n + 2 - 1 (i – 1)) is incorrect, as the correct relationship is n² = 2n.

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The area of the darkest shaded region would be 31.32 yd sq.

We know that the circle is a shape consisting of all points in a plane that are given the same distance from a given point called the center.

The area of the circle =πr²

We are given that the radius of circle is 10 yd.

The area of the circle =πr²

= 10 x 10 π

= 100π

Now the area of the octagon will be;

282.84 yd sq.

Therefore, the area of the darkest shaded region is;

area of the circle - area of the octagon

= 100π - 282.84

= 31.32 yd sq.

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To predict the number of situps a person who watches 13.5 hours of TV can do, we can use the given regression equation y = ax + b, where 'a' and 'b' are the coefficients and 'x' is the hours of TV watched.

Given:
a = -1.077
b = 30.98
x = 13.5

Step 1: Substitute the given values into the regression equation:
y = (-1.077)(13.5) + 30.98

Step 2: Perform the calculations:
y = (-14.5395) + 30.98

Step 3: Add the values:
y = 16.4405

Since we need the result to one decimal place, we can round it off to:
y ≈ 16.4

So, a person who watches 13.5 hours of TV per day can do approximately 16.4 situps.

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Converting mL (milliliters) to L (liters).

5,450 mL is equal to 5.45 L.

We have,

In the metric system, there are different units of measurement for volume, such as milliliters (mL) and liters (L).

One liter is equal to 1000 milliliters.

So, to convert a volume measurement from milliliters to liters, you need to divide the volume in milliliters by 1000.

This is because there are 1000 milliliters in one liter.

So, to convert 5,450 mL to L, you would divide by 1000 as follows:

5,450 mL ÷ 1000

= 5.45 L

Therefore,

5,450 mL is equal to 5.45 L.

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A normal education system that cannot accommodate individuals with inabilities often follows a traditional medical approach. This approach focuses on the diagnosis and treatment of disabilities, rather than considering the individual's needs in a holistic manner. As a result, these individuals require segregated facilities and a different education system.

A holistic social rights approach would emphasize the importance of including all individuals, regardless of their abilities, in a comprehensive education system. This approach seeks to ensure equal opportunities for all and recognizes the inherent dignity and worth of each person.

In contrast, the charity model views individuals with inabilities as recipients of benevolence from others. This can lead to a patronizing and disempowering attitude towards these individuals, and reinforces the idea that they should be segregated and provided with different facilities.

Lastly, the term "lay" refers to non-expert individuals or those without specialized knowledge in a specific field. Laypeople might not fully understand the nuances and complexities involved in accommodating individuals with inabilities within the education system. This lack of understanding can perpetuate the idea that segregated facilities and a different education system are necessary, instead of promoting inclusion and equal opportunities for all.

In summary, a normal education system that cannot accommodate individuals with inabilities often follows a traditional medical approach, which is in contrast to a holistic social rights approach. The charity model reinforces segregation, and the opinions of laypeople may perpetuate the need for segregated facilities and a different education system.

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The probability of dart landing on yellow region =  = 56.31%

Step 1; We need to determine the area of the blue region and the yellow region. To calculate the different areas we must use the areas of the shapes surrounding the particular shape.

First, we find the areas of all the shapes in the dartboard.

The area of the square with a side length 18 inches = 18 × 18 = 324 square inches.

The area of a circle with radius of 9 inches = π × 9 × 9 = 254.469 square inches.

The area of 2 triangles with a base 6 inches and height 6 inches = 2 × ( × 6 × 6) = 2 × 18 = 36 square inches.

The area of the inner square = 6 × 6 = 36 square inches.

The area of the inner circle with a radius 3 inches = π × 3 × 3 = 28.274 square inches.

Step 2; Now we calculate the areas of the blue and yellow regions.

The area of the blue region = Area of the outer square - Area of the outer circle =   324 - 254.469 = 69.531 square inches.

The area of the yellow region = Area of the outer circle - Area of 2 triangles - Area of the inner square = 254.469 - 36 - 36 = 182.469 square inches.

The area of the entire board is the same as the outer square area.

Step 3; To find any event's probability we divide the number of favorable outcomes by the total number of outcomes. Here, the favorable outcome is the area of the yellow region and the total number of outcomes is the total area of the dartboard.

The probability of the dart landing on the yellow region =  = 0.5631 = 56.31%.

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Answer:Domain is all real numbers

Step-by-step explanation:

f(x)=x^2

it is a parabola and all parabola’s domains are all real numbers

Answer:

15/8

Step-by-step explanation:

18/8 - 3/8 = 15/8

Answer:

15/8

Step-by-step explanation:

[tex]2 \times \frac{1}{4} - \frac{3}{8} [/tex]

First, combine the mixed fraction. 2 (2/1) is equal to 8/4 (multiply by 4/4). This comes out as 9/4.

9/4 - 3/8

Then, we need to multiply the first fraction by 2/2 to get a common denominator

18/8 - 3/8

Since the denominators are the same, we can subtract the numerators, 18 - 3 = 15.

The denominator is kept after doing the subtraction in the numerator. 15/8 is the answer, or 1 7/8 as a mixed fraction

We have shown that F is closed under both addition and scalar multiplication.

To show that F is closed under addition, let x = (x0, x1, x2, ...) and y = (y0, y1, y2, ...) be two sequences in F. We want to show that x+y is also in F, that is, (x+y)n+2 = (x+y)n+1 + (x+y)n for all n.

Using the definition of addition of sequences, we have (x+y)n+2 = xn+2 + yn+2 and (x+y)n+1 = xn+1 + yn+1. Substituting these into the equation to be proved, we get:

(x+y)n+2 = (x+y)n+1 + (x+y)n

xn+2 + yn+2 = xn+1 + yn+1 + xn + yn

Now, using the fact that x and y are both in F, we can simplify this equation as follows:

xn+1 + xn = xn+2

yn+1 + yn = yn+2

Substituting these into the previous equation, we get:

xn+2 + yn+2 = xn+2 + yn+2

This shows that x+y is also in F, so F is closed under addition.

To show that F is closed under scalar multiplication, let x = (x0, x1, x2, ...) be a sequence in F and let a be a scalar. We want to show that ax is also in F, that is, (ax)n+2 = (ax)n+1 + (ax)n for all n.

Expanding both sides of this equation using the definition of scalar multiplication, we get:

(ax)n+2 = axn+2

(ax)n+1 = axn+1

(ax)n = axn

Substituting these into the equation to be proved, we get:

axn+2 = axn+1 + axn

Now, using the fact that x is in F, we can simplify this equation as follows:

axn+1 + axn = axn+2

Substituting this into the previous equation, we get:

axn+2 = axn+2

This shows that ax is also in F, so F is closed under scalar multiplication.

Therefore, we have shown that F is closed under both addition and scalar multiplication.

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To find 80307 (mod 719) using techniques discussed in Section 8.4, follow these steps:

Step 1: Identify the given numbers:
- The dividend (the number being divided) is 80307.
- The divisor (the number to divide by) is 719.

Step 2: Perform the division operation:
Divide 80307 by 719 to get the quotient and remainder.

80307 ÷ 719 = 111 with a remainder of 678

Step 3: Interpret the remainder:
The remainder is the result of the modulo operation.

So, 80307 (mod 719) = 678.

Your answer is 678.

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Answer:

the first order linear differential equations among the given options are:

B. [tex]sin(x)dy/dx - 3y = 0[/tex]

F. [tex]xdy/dx - 4y = x^6*e^x[/tex]

Step-by-step explanation:

A first order linear differential equation has the form:

[tex]dy/dx + p(x)y = q(x)[/tex]

where p(x) and q(x) are functions of x.

Using this form, we can identify the first order linear differential equations among the given options:

A.[tex]dP/dt + 2tP = P + 4t - 2[/tex](Not first order linear)

B.[tex]sin(x)dy/dx - 3y = 0[/tex] (First order linear)

C. [tex]dy/dx = y^2 - 3y[/tex] (Not first order linear)

D. [tex]d^2y/dx^2 + sin(x)dy/dx = cos(x)[/tex] (Not first order linear)

E.[tex](dy/dx)^2 + cos(x)y = 5[/tex] (Not first order linear)

F.[tex]xdy/dx - 4y = x^6e^x[/tex] (First order linear)

Therefore, the first order linear differential equations among the given options are:

B. [tex]sin(x)dy/dx - 3y = 0[/tex]

F[tex]xdy/dx - 4y = x^6*e^x[/tex]

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Answer:

B. Negative

Step-by-step explanation:

Slope = rise/run or (y2 - y1) / (x2 - x1)

Pick 2 points (0, -2) (-2, -1)

We see the y increase by 1 and the x decrease by 2, so the slope is

m = -1/2

So, the answer is B. Negative

The equation for the least-squares regression line is given by:

y = a + bx

where y is the dependent variable (the variable being predicted), x is the independent variable (the variable used to make predictions), a is the y-intercept (the value of y when x=0), and b is the slope of the line (the change in y for a unit change in x).

To find the values of a and b that minimize the sum of the squared residuals (the vertical distance between each observed data point and the line), we use the method of least squares. This involves finding the values of a and b that minimize the following expression:

∑(y - ŷ)^2

where y is the observed value of the dependent variable, ŷ is the predicted value of the dependent variable based on the regression line, and the sum is taken over all data points.

The least-squares regression line is a linear model that approximates the relationship between the independent and dependent variables. It is often used in statistics to make predictions or estimate the value of the dependent variable for a given value of the independent variable. The slope of the line (b) indicates the strength and direction of the relationship between the variables, while the y-intercept (a) represents the value of the dependent variable when the independent variable is zero. The accuracy of the predictions made by the regression line can be assessed by calculating the coefficient of determination (R^2), which measures the proportion of the total variation in the dependent variable that is explained by the independent variable.

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The mean is a measure of central tendency that represents the average value of a set of data. To find the mean of the monthly salaries of the 10 employees in the local travel office, we need to add up all the salaries and divide by the total number of employees.

So, if we add up all the salaries, we get:

1550 + 1710 + 1630 + 1000 + 1400 + 1610 + 1890 + 1300 + 2700 + 5800 = 19,940

Then, we divide this sum by the total number of employees, which is 10.

Mean = 19,940 / 10 = 1,994

Therefore, the mean monthly salary for the 10 employees in the local travel office is $1,994.

It's important to note that the mean is a useful measure of central tendency, but it can be affected by outliers. In this case, the salary of $5,800 is significantly higher than the other salaries, which may skew the mean. To get a better understanding of the distribution of salaries, it may be useful to also look at other measures such as the median and mode.
To find the mean monthly salary of the 10 employees at the local travel office, follow these steps:

1. Add up all the monthly salaries: 1550 + 1710 + 1630 + 1000 + 1400 + 1610 + 1890 + 1300 + 2700 + 5800 = 20,590.

2. Divide the total sum by the number of employees (10): 20,590 / 10 = 2,059.

The mean monthly salary of the 10 employees at the local travel office is 2,059. The mean represents the average salary of the employees, providing a general idea of the salary level at the office. In this case, the mean gives a local perspective on the financial situation of the employees within the travel office, allowing for comparisons with other companies or the industry standard.

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One man alone can finish the work in about 1.26 days, and one boy alone can finish the work in about 33.33 days.

Let the work be "1" unit, and let the rate of work of one man be "m" and that of one boy be "b". Then we can set up the following system of equations based on the given information:

8m + 12b = 1/10 (equation 1)

6m + 8b = 1/14 (equation 2)

We have two equations and two unknowns, so we can solve for "m" and "b". First, we'll simplify the equations by multiplying both sides of each equation by the least common multiple of the denominators (10*14 = 140):

112m + 168b = 14 (equation 1, multiplied by 140)

84m + 112b = 10 (equation 2, multiplied by 140)

Now we can solve this system of linear equations using either substitution or elimination. Let's use elimination by multiplying equation 2 by -12 and adding it to equation 1:

112m + 168b = 14

-84m - 112b = -120

28m + 56b = -106

Simplifying, we get:

7m + 14b = -53/2 (equation 3)

Now we can solve for "m" or "b" by using either equation 2 or equation 3. Let's use equation 3:

7m + 14b = -53/2

14m + 28b = -53

7m + 14b = -53/2

Subtracting the bottom equation from the top equation, we get:

-7m - 14b = 53/2

Multiplying both sides by -1, we get:

7m + 14b = 53/2

Adding this equation to equation 3, we get:

21m = -53/2

Solving for "m", we get:

m = -53/42 = -1.26 (rounded to two decimal places)

Now we can use equation 2 to solve for "b":

6m + 8b = 1/1

Substituting "-1.26" for "m", we get:

6(-1.26) + 8b = 1/14

Simplifying and solving for "b", we get:

b = 1/14 - (-7.56)/8 = 0.03 (rounded to two decimal places)

Therefore, one man alone can finish the work in about 1.26 days, and one boy alone can finish the work in about 33.33 days.

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The 95% confidence interval, we can estimate that the proportion of the entire voting population (p) that prefers Candidate A is between 0.572 and 0.668, expressed as decimals to three places

To estimate the proportion (p) of the entire voting population that prefers Candidate A, we'll use the information provided and calculate the 95% confidence interval. Here are the steps:

1. Calculate the sample proportion (p_hat): Divide the number of people who preferred Candidate A (248) by the total number of people sampled (400).
  p_hat = 248 / 400 = 0.62

2. Determine the confidence level (95%) and find the corresponding z-score. For a 95% confidence level, the z-score is 1.96.

3. Calculate the margin of error (ME) using the formula:
 [tex]ME = z-score \sqrt{\frac{(p_hat)(1-p_hat)}{n} }[/tex]
  [tex]ME = 1.96 \sqrt{\frac{0.062(1-0.62)}{400} }[/tex]
  ME = 0.048

4. Calculate the 95% confidence interval:
  Lower bound = p_hat - ME = 0.62 - 0.048 =0.572
  Upper bound = p_hat + ME = 0.62 + 0.048= 0.668

Based on the 95% confidence interval, we can estimate that the proportion of the entire voting population (p) that prefers Candidate A is between 0.572 and 0.668, expressed as decimals to three places.

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Answer:

Sarah receives $2.48 from the cashier

Step-by-step explanation:

Cost of the scooter = $67.52

Money paid by Sarah to the cashier = $70

Sarah receives money = money paid by Sarah - the cost of the scooter

                                      = $70 - $67.52

                                      = $2.48

Sarah receives $2.48 from the cashier.