The mean incubation time for a type of fertilized egg kept at 100.6°F is 22 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 22 days.
(a) What is the probability that a randomly selected fertilized egg hatches in less than 20 days?
(b) What is the probability that a randomly selected fertilized egg hatches between 18 and 22 days?
(c) What is the probability that a randomly selected fertilized egg takes over 24 days to hatch?