A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 79 and a standard deviation of 8. Complete parts (a) through (d). (I) .a. What is the probability that a student scored below 91 on this exam? The probability that a student scored below 91 is 0.9332 . (Round to four decimal places as needed.) b. What is the probability that a student scored between 71 and 102? The probability that a student scored between 71 and 102 is El. (Round to four decimal places as needed.)