Review the information given in question 62. What is the probability that a sample of 50 babies will have a mean weight greater than 8 lb?

Question 62

Suppose an obstetrician knows from past experience that the mean weight of a newborn baby is 7.5 lb with a standard deviation of 2 lb. The doctor randomly chooses five newborn babies. What is the expected value of the sample mean weight? What is the expected value of the sample mean variance?