Years to Complete a Graduate Program: The average number of years a person takes to complete a graduate degree program is 3. The standard deviation is 4 months. Assume the variable is normally distributed. If an individual enrolls in the program, find the probability that it will take:
a. More than 4 years to complete the program:
b. Less than 3 years to complete the program:
c. Between 3.8 and 4.5 years to complete the program:
d. Between 2.5 and 3.1 years to complete the program