In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule:
The top 10% receive A's. The next 20% receive B's. The middle 40% receive C's. The next 20% received D's. The bottom 10% receive F's. What is the least amount of points that a student must score, on the final exam, in order to earn a C? (Round your answer to two decimal places. )
the answer is 72?
