Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 76 and a standard deviation of 7.2Find the probability of the following:**(use 4 decimal places)**a.) The probability that one student chosen at random scores above an 81. b.) The probability that 20 students chosen at random have a mean score above an 81. c.) The probability that one student chosen at random scores between a 71 and an 81. d.) The probability that 20 students chosen at random have a mean score between a 71 and an 81.