The length of Atlantic croaker fish are normally distributed, with a mean of 9 inches and a standard deviation of 2 inches. (a) (5 points) If 5 Atlantic croaker fish are randomly selected, find the probability that their mean length is less than 11 inches. (b) (5 points) Suppose we have a random sample of 5 Atlantic croaker fish. What is the value such that 20 percent of the time, the sample mean would be less than this value