Hi, I need help solving this problem. I don't understand how to set up.

h. Babies who are born on or before days are considered premature. (Round to the nearest integer as needed.) The lengths of pregnancies are normally distributed with a mean of 267 days and a standard deviation of 15 days. 3. Find the probability of a pregnancy lasting 307 days or longer. b. If the length of pregnancy is in the lowest 3%, then the baby is premature. Find the length that separates premature babies from those who are not premature. Click to view page 1 of the table. Click to view page 2 of the table. a. The probability that a pregnancy will last 307 days or longer is D. (Round to four decimal places as needed.)