Question

I keep getting this wrong...anyone who can help step by step?

Answer 1

we are given the mean weight of 22 textbooks, and that is 80 ounces. We are also given a standard deviation of 8.7 ounces. We are required to find the population mean with a 95% copnfident. we can use the following formula

`\mu=\bar{X}\pm\frac{2\sigma}{\sqrt[]{n}}`

Where the greek letter sigma is the standard deviation and "n" is the total population. Replacing the known values we get:

`\mu=80\pm\frac{2(8.7)}{\sqrt[]{22}}`

Solving for the plus sign

`\mu=80+37.1=117.1`

Solving for the minus sign

`\mu=80-37.1=42.90`

The interval