An instructor has given his final exam,and scores are approximately normally distributed.Nancy scores a 90 and Ronald scores a 75.The characteristics of the distribution are as follows:
= 85,
S² = 36.What is Ronald's approximate percentile rank?

Question

Quizplus · Accepted Answer

Ronald's z-score is (75-85)/6 = -1.67. The area to the left of this z-score is 0.0475, which means that Ronald's approximate percentile rank is 4.75%.

An Instructor Has Given His Final Exam,and Scores Are Approximately