1 - 2. Assume the length of pregnancies vary according to a normal distribution with a mean of 266 days and a standard deviation of 16 days. Let X represent the length of a pregnancy.

1. What is the probability that X will be between 250 and 274 days? ___________

2. Find a value of X (i.e., Xo), such that there is a .209 probability that the length of the pregnancy will be less than the value of Xo.