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"In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9.

"In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
1) the top 10% receive A
2) the next 20% receive B
3) the middle 40%receive C
4) the next 20% receive D
5) the bottom 10% receive F.
Find the lowest score on the final exam that would qualify a student for an (A, B, C, D)

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