The mean incubation time for a type of fertilized egg kept at 100.7°F is 20 days. Suppose that the

incubation times are approximately normally distributed with a standard deviation of 11 day.

(a) What is the probability that a randomly selected fertilized egg hatches in less than 18 days?

(b) What is the probability that a randomly selected fertilized egg hatches between 19 and 20 days?

(c) What is the probability that a randomly selected fertilized egg takes over 22 days to hatch?

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