Whales have one of the longest gestation periods of any mammalt 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 at Find the standard score associated with a gestation period of 139 months b Using the Empirical Rule and your answer to part a, what percentage of whale pregnancies will have a gestation period between 133 and 15 months? ct Would it be unusual for a whale to have a gestation period of 19 months? Why or why not? at The standard score associated with a gestation period of 139 months is z = (Type an integer or a decimal. Do not round.)