The Langtry of a pregnancy is normally distributed with a mean of 268days and a standard deviation of 15. A.Find the percentage of pregnancies less then 268 days. B. Find the percentage of pregnancies...

The Langtry of a pregnancy is normally distributed with a mean of 268days and a standard deviation of 15. A.Find the percentage of pregnancies less then 268 days. B. Find the percentage of pregnancies lasting less then 261 days. C. If pregnancies is considered premature if ot is in the lowest 3% of pregnancies, find the number of days which separates a premature baby from those who are not premature.