You work for a consumer advocate agency and want to find the mean repair cost of a washing machine. as part of your study, you randomly select 40 repair costs and find the mean to be $100.00. from past studies, you assume that the standard deviation σ is $17.50.

construct a 90% confidence interval and interpret it.

construct a 95% confidence interval and interpret it.

construct a 99% confidence interval and interpret it.

determine the minimum required sample size if you want to be 95% confident that the sample mean is within $10 of the population mean.

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

simplifying

5(x + -6) = 2(x + 3)

reorder the terms:

5(-6 + x) = 2(x + 3)

(-6 * 5 + x * 5) = 2(x + 3)

(-30 + 5x) = 2(x + 3)

reorder the terms:

-30 + 5x = 2(3 + x)

-30 + 5x = (3 * 2 + x * 2)

-30 + 5x = (6 + 2x)

solving

-30 + 5x = 6 + 2x

solving for variable 'x'.

move all terms containing x to the left, all other terms to the right.

add '-2x' to each side of the equation.

-30 + 5x + -2x = 6 + 2x + -2x

combine like terms: 5x + -2x = 3x

-30 + 3x = 6 + 2x + -2x

combine like terms: 2x + -2x = 0

-30 + 3x = 6 + 0

-30 + 3x = 6

add '30' to each side of the equation.

-30 + 30 + 3x = 6 + 30

combine like terms: -30 + 30 = 0

0 + 3x = 6 + 30

3x = 6 + 30

combine like terms: 6 + 30 = 36

3x = 36

divide each side by '3'.

x = 12

simplifying

x = 12

this should .

total of apples - take away four

6-4 = 2

answer is 2 apples

a ≈ 172.05

step-by-step explanation:

the pictures.