Given a normal population whose mean is 500 and whose standa

Given a normal population whose mean is 500 and whose standard deviation is 20, find each of the following: A. The probability that a random sample of 5 has a mean between 503 and 508. Probability = B. The probability that a random sample of 15 has a mean between 503 and 508. Probability = C. The probability that a random sample of 21 has a mean between 503 and 508. Probability =