Question

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 308 days or longer.
b. if the length of pregnancy is in the lowest 2 ​%, then the baby is premature. find the length that separates premature babies from those who are not premature.

Answer 1

a. The probability a pregnancy will last 308 days or longer is approximately 0.26%

b. A baby will be considered premature if the pregnancy lasts 235 days or less.