SURVEY:

A previous study administered to US adults showed that the amount of sleep (in hours)they get in a 24-hour period is normally distributed with a mean of 7 hours and a standard deviation of 1.25 hours.

Questions:(Please include all work, including the calculator command if any)

1.Your boss, setting an example for the employees, said that he slept 6.75 hours last night to prepare for the meeting. What percent of adults from the survey slept longer than the boss?

2.What percent of data in the survey lies in the interval from 5.5 hours to 8.5 hours?

3.What interval about the mean includes the middle 95% of the data in the survey?

4.30% of adults in the survey sleep less than how many hours of sleep?

5.10% of adults in the survey sleep more than how many hours of sleep?