Use the Following Information for Following Questions

Multiple Choice

Use the following information for following questions .
The distribution of the number of hours people spend at work per day is unimodal
and symmetric with a mean of 8 hours and a standard deviation of 0.5 hours.
-95% of all people work between and hours per day?

A) 7.5 and 8.5 hours
B) 7 and 8.5 hours
C) 7.5 and 9 hours
D) 7 and 9 hours