The mean incubation time for a type of fertilized egg kept at 100.6?°F is 20 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 1 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?
?(a) The probability that a randomly selected fertilized egg hatches in less than 18 days is nothing.
?(Round to four decimal places as? needed.)