# Question

The mean incubation time of fertilized chicken eggs kept at 100.5°F in a still-air incubator is 21 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 1 day. Source: University of Illinois Extension

(a) What is the probability that a randomly selected fertilized chicken egg hatches in less than 20 days?

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

(c) What is the probability that a randomly selected fertilized chicken egg hatches between 19 and 21 days?

(d) Would it be unusual for an egg to hatch in less than 18 days? Why?

(a) What is the probability that a randomly selected fertilized chicken egg hatches in less than 20 days?

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

(c) What is the probability that a randomly selected fertilized chicken egg hatches between 19 and 21 days?

(d) Would it be unusual for an egg to hatch in less than 18 days? Why?

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