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
[tex]\mu=\bar{X}\pm\frac{2\sigma}{\sqrt[]{n}}[/tex]
Where the greek letter sigma is the standard deviation and "n" is the total population. Replacing the known values we get:
[tex]\mu=80\pm\frac{2(8.7)}{\sqrt[]{22}}[/tex]
Solving for the plus sign
[tex]\mu=80+37.1=117.1[/tex]
Solving for the minus sign
[tex]\mu=80-37.1=42.90[/tex]
The interval
