I need help ASAP yikes

Answer:

0.89417

Step-by-step explanation:

Using the relation to obtain the Zscore :

Z = (x - mean) ÷ standard deviation / sqrt(n)

x = 0.8535

Mean = 0.8565

Standard deviation = 0.0518

Sample size, n = 465

P(x ≤ 0.8535) = (0.8535 - 0.8565) ÷ 0.0518/sqrt(465)

P(x ≥ 0.8535) = - 0.003 / 0.0024021

P(x ≥ 0.8535) = - 1.249

P(Z ≥ - 1.249) = 0.89417

Answer: True

Step-by-step explanation: This statement is true because when clusters are heterogeneous they are a "scaled-down version" of the population sampled. I hope this helped!

Answer:true

Step-by-step explanation:

The value of S, which represents the length of each side of the square, is 4 miles.

To find the value of S, we need to determine the length of each side of the square. Given that the perimeter of the square is 16 miles, we can use the formula for the perimeter of a square, which is 4 times the length of a side.

Perimeter = 4 × S

Given that the perimeter is 16 miles, we can substitute this value into the equation:

16 = 4 × S

To solve for S, we divide both sides of the equation by 4:

16 ÷ 4 = S

4 = S

Therefore, S, which stands for the square's side lengths, has a value of 4 miles.

So, S = 4 miles.

This means that each side of the square measures 4 miles, and the square has equal sides and right angles at each corner.

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The integral of (42³ - 2r + 7) dz is equal to (42³ - 2r + 7)z + C.

To integrate the function (42³ - 2r + 7) dz, we treat r as a constant and integrate with respect to z. The integral of a constant with respect to z is simply the constant multiplied by z:

∫ (42³ - 2r + 7) dz = (42³ - 2r + 7)z + C

where C is the constant of integration.

Note: The integral of a constant term (such as 7) with respect to any variable is simply the constant multiplied by the variable. In this case, the variable is z.

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(a)i. Evaluating the constant:

\($$\int_{-1}^{1} c(1+x)(1-2x) dx = 1$$$$\implies c = \frac{3}{4}$$\)

Therefore, the probability density function is:

\($$f(x) = \frac{3}{4} (1+x)(1-2x), -1< x < 1$$\) ii. Plotting the probability density function:

From the graph, it is observed that the density function is skewed to the left.

(b)i. The mean:

\($$E(X) = \int_{-1}^{1} x f(x) dx$$$$E(X) = \int_{-1}^{1} x \frac{3}{4} (1+x)(1-2x) dx$$$$E(X) = 0$$\)

ii. The second moment about the origin:

\($$E(X^2) = \int_{-1}^{1} x^2 f(x) dx$$$$E(X^2) = \int_{-1}^{1} x^2 \frac{3}{4} (1+x)(1-2x) dx$$$$E(X^2) = \frac{1}{5}$$\)

Therefore, the variance is:

\($$\sigma^2 = E(X^2) - E(X)^2$$$$\implies \sigma^2 = \frac{1}{5}$$\)

iii. The standard deviation:

$$\sigma = \sqrt{\sigma^2} = \sqrt{\frac{1}{5}} = \frac{\sqrt{5}}{5}$$(c)

i. The cumulative distribution function:

\($$F(x) = \int_{-1}^{x} f(t) dt$$$$F(x) = \int_{-1}^{x} \frac{3}{4} (1+t)(1-2t) dt$$\)

ii. The probability density function can be obtained by differentiating the cumulative distribution function:

\($$f(x) = F'(x) = \frac{3}{4} (1+x)(1-2x)$$\)

iii. Evaluating\(P(-0.2 < X <0.2):$$P(-0.2 < X <0.2) = F(0.2) - F(-0.2)$$$$P(-0.2 < X <0.2) = \int_{-0.2}^{0.2} f(x) dx$$$$P(-0.2 < X <0.2) = \int_{-0.2}^{0.2} \frac{3}{4} (1+x)(1-2x) dx$$$$P(-0.2 < X <0.2) = 0.0576$$\)

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Answer: = \(6x^{2}\) − xy − \(40y^{2}\)

Step-by-step explanation:

{Apply\:FOIL\:method}:\quad

\left(a+b\right)\left(c+d\right)=ac+ad+bc+bd

a=2x,\:b=5y,\:c=3x,\:d=-8y

{Apply\:minus-plus\:rules}

+\left(-a\right)=-a

=2\cdot \:3xx-2\cdot \:8xy+5\cdot \:3xy-5\cdot \:8yy

Simplify 2 · 3xx − 2 · 8xy + 5 · 3xy − 5 · 8yy: 6x − xy − 40y

2 2

= \(6x^{2}\) − xy − \(40y^{2}\)

Hope This Helps!

Answer:

40-30

Step-by-step explanation:

Here higher term minus lower term

The total weight is 18.5 kilograms

Answer:

4cm

Step-by-step explanation:

2t2 is 4 4 is the cm

purrr

periodtttttt ahhhhhh

its 4cm purrrr

Answer:

c

Step-by-step explanation:

the 99% confidence interval estimate for the proportion of boys born to parents using the YSORT method is: (0.7584, 0.8820)

what is an algebraic expression?

An algebraic expression is a mathematical phrase consisting of numbers, variables, and mathematical operations such as addition, subtraction, multiplication, and division.

a. The point estimate of the population proportion of boys born to parents using the YSORT method can be calculated as the ratio of the number of boys to the total number of babies:

239/291 ≈ 0.8202

Therefore, the best point estimate of the population proportion of boys born to parents using the YSORT method is approximately 0.8202.

b. To construct a 99% confidence interval estimate of the proportion of boys born to parents using the YSORT method, we can use the following formula:

p ± z*sqrt(p(1-p)/n)

where p is the point estimate of the population proportion, z* is the critical value from the standard normal distribution for the desired confidence level (99% in this case), and n is the sample size.

Using the values from part (a), we have:

p = 0.8202

n = 291

z* = 2.576 (from the standard normal distribution table for a 99% confidence level)

Plugging in these values, we get:

0.8202 ± 2.576sqrt(0.8202(1-0.8202)/291)

Simplifying, we get:

0.8202 ± 0.0618

c. Based on the results, the YSORT method appears to be effective in increasing the probability of conceiving a boy. The point estimate of 0.8202 is significantly higher than the theoretical probability of 0.5 for a randomly selected baby to be a boy.

Therefore, the 99% confidence interval estimate for the proportion of boys born to parents using the YSORT method is: (0.7584, 0.8820)

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Answer:

Step-by-step explanation:

98°,100°

Answer:  

1/16, 1/4, 1, 4, 16, 64.

Step-by-step explanation:

Answer:

45 different sandwiches

Step-by-step explanation:

Assuming A and B are prime numbers, and A > B, and their LCM is 161, we get A = 23 and B = 7. Substituting these values in the expression 3B - A, we get the value of 3B - A as -2.

The LCM of two prime numbers can only be equal to their product. Therefore, we have:

A x B = 161

The prime factors of 161 are 7 and 23. Since A is greater than B, we can assume that A = 23 and B = 7.

Substituting these values in the expression 3B - A, we get:

3B - A = 3(7) - 23 = -2

Therefore, the value of 3B - A is -2.

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Answer:777

Step-by-step explanation: I do not care

There are 333 pages are in my book.

What is an expression?

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Given that;

There are more than 200 pages but fewer than 800 in my book.

And, All the digits of my number are the same and the number is divisible by 9.

Now,

Let a number with three same digit = xxx

So, We get;

200 < xxx < 800

Since, the number is divisible by 9.

So, By the rule of the number divide by 9, we get;

x + x + x = 9k

3x = 9k

for k = 1;

x = 3

Thus, Number of pages = 333

Therefore,  

There are 333 pages are in my book.

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The method to get the  future cash flow using the cumulative present value factor is explained.

To calculate the numbers you mentioned, you need to use the cumulative present value factor (PV factor) formula. The PV factor represents the present value of a future cash flow discounted at a given interest rate.

To calculate the cumulative PV factor at 2.5% for 12 periods (10.25776),

you need to multiply the PV factor for each period. The formula for the PV factor is 1 / (1 + interest rate) ^ number of periods.

For example, to calculate the PV factor for each period, you would use the following formula: 1 / (1 + 0.025) ^ period number.

Then, multiply these PV factors for each period to get the cumulative PV factor for 12 periods.

To calculate the cumulative PV factor at 2.5% for the 13th to 37th period (13.69955), you would follow the same steps as above.

However, instead of multiplying the PV factors for all 37 periods, you would subtract the cumulative PV factor for 12 periods from the cumulative PV factor for 37 periods.

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Answer:

c

Step-by-step explanation:

\((a^{m})^{n} = a^{m*n}\\\\\frac{1}{a^{m}}=a^{-m}\)

\((\frac{x^{4}}{7^{-8}})^{-7} = \frac{x^{4*(-7)}}{7^{-8 * (-7)}}\\\\=\frac{x^{-28}}{7^{56}}\\\\= x^{-28}*7^{-56}\)

Answer:

C

Step-by-step explanation:

Answer:

The British controlled Africa, but feelings of nationalism started by the pan Africa movement lead to more and more people in Africa wanting their independence. ... Nationalism lead to the Kenyans feeling that their land was taken unfairly. Eventually, conflict led to independence.

Step-by-step explanation:

Answer:

To better understand the data you're working with

Step-by-step explanation:

Note that, the sample is a subset of your whole population (population here is a general definition, it could be a population of cars for example), which means that if you want to understand your population your best "bet" would be using a sample to try to estimate some unknown characteristics of your population. Let's suppose you want to estimate the true mean of your population, then you would need a sample, and if this sample is big enough you could approximate the estimative to the true mean.

It's hard to say exactly what this survey could mean, but the general idea is to understand your data a little more, see if there is any pattern, if a certain value occurs more than others, to calculate the sample mean, median and standard deviation, and so on...

Hope it helped!

Answer:

The value of the test statistic is z = -0.877.

Step-by-step explanation:

Testing the difference in mean time spent on housework between husbands and wives.

At the null hypothesis, we test if there is no difference, that is, the subtraction of the means is 0:

\(H_0: \mu_H - \mu_W = 0\)

At the alternate hypothesis, we test if there is a difference, that is, the subtraction of the means is different from 0.

\(H_1: \mu_H - \mu_W \neq 0\)

The test statistic is:

\(z = \frac{X - \mu}{s}\)

In which X is the sample mean, \(\mu\) is the value tested at the null hypothesis, and s is the standard error.

0 is tested at the null hypothesis:

This means that \(\mu = 0\)

For the wives the mean was 7 hours/week and for the husbands the mean was 4.5 hours/week. The standard deviation of the differences in time spent on house work was 2.85.

This means that \(X = 4.5 - 7 = -2.5, s = 2.85\)

What is the value of the test statistic for testing the difference in mean time spent on housework between husbands and wives?

\(z = \frac{X - \mu}{s}\)

\(z = \frac{-2.5 - 0}{2.85}\)

\(z = -0.877\)

The value of the test statistic is z = -0.877.

According to the regression equation, if Camilla scores 100 points higher on her Verbal SAT than her friend, the model predicts her Math SAT score to be 67 points higher than her friend's.

In the given regression equation, the coefficient of the Verbal variable is 0.67, indicating that for every 1-point increase in Verbal SAT score, the predicted Math SAT score increases by 0.67 points.

If Camilla scores 100 points higher on her Verbal SAT than her friend, we can use this information to calculate the predicted difference in their Math SAT scores.

The predicted Math SAT score for Camilla is given by:

(predicted MATH for Camilla) = 210 + 0.67*(Camilla's Verbal)

Similarly, the predicted Math SAT score for her friend is:

(predicted MATH for friend) = 210 + 0.67*(Friend's Verbal)

Subtracting the two equations, we can determine the predicted difference:

(predicted MATH for Camilla) - (predicted MATH for friend) = 0.67*(Camilla's Verbal - Friend's Verbal)

Given that Camilla scores 100 points higher on her Verbal SAT, we substitute the values:

(predicted MATH for Camilla) - (predicted MATH for friend) = 0.67*(100)

Calculating the result, we find that the model predicts Camilla's Math SAT score to be 67 points higher than her friend's.

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To solve the problem, we can use trigonometry and vector addition to determine how far Natalie is from Little Rock after flying off course.

First, let's find the horizontal and vertical components of the displacement vector:

Horizontal component = Distance * cos(angle) = 75 * cos(15°)

Vertical component = Distance * sin(angle) = 75 * sin(15°)

Now, we can find the remaining distance from Little Rock by subtracting the horizontal component from the total distance:

Remaining distance = Total distance - Horizontal component

Remaining distance = 319 - (75 * cos(15°))

To find how far Natalie is from Little Rock, we can use the Pythagorean theorem:

Distance from \(Little Rock = \sqrt{((Remaining distance)^2 + (Vertical component)^2)}\)

Distance from Little Rock = sqrt((319 - (75 * cos(15°)))² + (75 * sin(15°))²)

Let's calculate the values:

Horizontal component = 75 * cos(15°) ≈ 71.981

Vertical component = 75 * sin(15°) ≈ 19.256

Remaining distance = 319 - 71.981 ≈ 247.019

Distance from Little Rock ≈ sqrt((247.019)² + (19.256)²) ≈ 248.573

Therefore, Natalie is approximately 248.573 miles from Little Rock after flying off course.

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Answer:

Im pretty sure is B but it might be C.

Step-by-step explanation:

Answer:

y=-0.5x+8

Step-by-step explanation:

stat, or just rise over run

Answer: 1280

Step-by-step explanation: LxWxH = 16 X 10 X 8

The Area of Triangle is 30.85 unit².

Heron's formula, formula credited to Heron of Alexandria (c. 62 ce) for finding the area of a triangle in terms of the lengths of its sides.

In symbols, if a, b, and c are the lengths of the sides:

Area = √s(s - a)(s - b)(s - c) where s is half the perimeter, or (a + b + c)/2.

The semi perimeter

s =(16 + 10 + 8)/2 = 34/2 = 17

So, the Area of Triangle

= √s(s- a)(s -b )(s-c)

= √17 (17-16)(17-10)(17-8)

= √17 x 1 x 7 x 9

= 30.85 unit²

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According to the data, the percentages in the table from left to right and top to bottom are: 67.4, 34.5, 32.5, 65.4

To find the percentages to complete the table we must perform the following procedure:

We must add the values as shown below:

Students studying less than eight hours

Then we must find the percentages with rules of 3:

Students who study more than eight hours:

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Answer:

Step-by-step explanation:

$335-$50 = $285

p = $285/(6 payments) = $47.50/payment