Whales have one of the longest gestation periods of any mammal. According to a website, the mean gestation period for a whale is 15 months. Assume the distribution of gestation periods is Normal with a standard deviation of 1.1 months. a. Find the standard score associated with a gestation period of 13.9 months. b. Using the Empirical Rule and your answer to part a, what percentage of whale pregnancies will have a gestation period between 13.9 and 15 months? c. Would it be unusual for a whale to have a gestation period of 19 months? Why or why not? a. The standard score associated with a gestation period of 13.9 months is z = E. (Type an integer or a decimal. Do not round.)