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1. The mean incubation time for a type of fertilized egg kept at a certain temperature is 17 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 4 days. a) Find the probability that a randomly selected fertilized egg takes over 16 days to hatch. Would this be unusual? (5 pt) X = 16 Z =X-M p( X 7 16) = P(27-.25) =. 4013 16-17 = - 0.25 4 b) Find the 21st percentile. (3 pts)