7. Suppose there are 5 quizzes given in a certain college class. If Amy earned grades of 88%, 76%, 91%, and 71% on her first four quizzes, what score would she need to earn on the fifth quiz to guarantee that her quiz average is 80% or better? Answer: 8. Suppose that IQ scores have a bell-shaped distribution with a mean of 101 and a standard deviation of 13. Using the empirical rule, approximately what percentage of IQ scores are between 75 and 127