The Length of Time Presidents of Universities Stay in Office

The length of time presidents of universities stay in office is normally distributed with a mean of 5 years and a standard deviation of 2 years. What percent of university presidents stay in office
A) More than 9 years? __________
B) Less than 3 years? __________
C) Between 3 and 7 years? __________
D) Is this problem about a frequency distribution or a sampling distribution? (frequency / sampling)
E) What is the median number of years university presidents stay in office? __________