Using the Normal Distribution · Exercise 34
The length of a pregnancy of a certain female animal is normally distributed with a mean of 280 days and a standard deviation of 13 days. The father was not present from 240 to 306 days before the birth of the offspring, so the pregnancy would have been less than 240 days or more than 306 days long, if he was the father. What is the probability that he was NOT the father? What is the probability that he could be the father? Calculate the z-scores first, and then use those to calculate the probability.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Statistics · §6.2 Using the Normal Distribution · Exercise 34
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