Whales have one of the longest gestation periods of any mammal. According to whalefacts.org, the mean gestation period for a whale is 14 months. Assume the distribution of gestation periods is Normal with a standard deviation of 1.2 months.

a. Find the standard score associated with a gestational period of 12.8 months.

b. Using the Empirical Rule and your answer to part a, what percentage of whale pregnancies will have a gestation period between 12.8 months and 14 months?

c. Would it be unusual for a whale to have a gestation period of 18 months? Why or why not?