Weights of babies at the local community hospital have a distribution that is approximately normal with a mean weight of 7.43 pounds and a standard deviation of 1.25 pounds. A premature baby can be classified as being less than 5.51 pounds. Answer the following questions:
a. Find the probability of a randomly selected baby weighing less than 5.51 pounds.
b. If 3 babies are randomly selected, What is the probability that their average birth weight will be greater than 5.51 pounds?