A Study of 40 White Mice Showed That Their Average $3.04 < \mu < 3.36$

Multiple Choice

A study of 40 white mice showed that their average weight was 3.20 ounces. The standard deviation of the population is 0.8 ounces. Which of the following is the 80%
Confidence interval for the mean weight per white mouse?

A) $3.04 < \mu < 3.36$
B) $2.88 < \mu < 3.52$
C) $3.12 < \mu < 3.28$
D) $3.09 < \mu < 3.31$