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}}](https://img.qammunity.org/2023/formulas/mathematics/college/wx5t04wepgy88b2svjvzscc3de3q63c6cf.png)
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}}](https://img.qammunity.org/2023/formulas/mathematics/college/trd4obdnec4o45x12o28arg3qb7ah66et4.png)
Solving for the plus sign

Solving for the minus sign

The interval