Suppose the scores of all the quizzes in Ms. Chauvet’s class were Normally distributed with mean 83 and standard deviation 5. a. What percent if scores are between 78 and 93? Use the 68-95-99.7 rule.

b. A score greater than 90 earns an A. What percent of quizzed earn an A?

c. What percent of scores fall between 71 and 95?

d. What score would place a student in the 20th percentile?