The lengths of pregnancies are normally distributed with a mean of days and a standard deviation of days. a. In a letter to an advice column, a wife claimed to have given birth days after a brief visit from her husband, who was working in another country. Find the probability of a pregnancy lasting days or longer. What does the result suggest?
b. If the length of pregnancy is in the lowest %, then the baby is premature. Find the length that separates premature babies from those who are not considered premature.