The annual rainfall in a certain region is approximately normally distributed with mean 40.3 inches and standard deviation 5.3 inches. Round answers to 4 decimal places. Use Excel to answer these questions. a) What is the probability that a randomly selected year had an annual rainfall of less than 43 inches? b) What is the probability that a randomly selected year had an annual rainfall of more than 38 inches? c) What is the probability that a randomly selected year had an annual rainfall of between 37 inches and 42 inches?