Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 77 and a standard deviation of 7.5 Find the probability of the following: **(use 4 decimal places)** a.) The probability that one student chosen at random scores above an 82 . b.) The probability that 20 students chosen at random have a mean score above an 82 . c.) The probability that one student chosen at random scores between a 72 and an 82 . d.) The probability that 20 students chosen at random have a mean score between a 72 and an 82