Professor Elderman Has Given the Same Multiple Choice Final Exam

Multiple Choice

Professor Elderman has given the same multiple choice final exam in his Principles of Microeconomics class for many years.After examining his records from the past 10 years,he finds that the scores have a mean of 76 and a standard deviation of 12. Refer to Exhibit 7-4.Professor Elderman offers his class of 36 a pizza party if the class average is above 80.What is the probability that he will have to deliver on his promise?

A) 0.0228
B) 0.3707
C) 0.6293
D) 0.9772