The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days. A. Find the probability of a pregnancy lasting 309 days or longer. B. If the length of pregnancy is in the lowest 4%, then the baby is premature. Find the length that separates premature babies from those who are not premature.
A. The probability that a pregnancy will last 309 days or longer is___(round to four decimal places as needed)
B. Babies who are born on or before_____days are considered premature. (round to the nearest integer)
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