A teacher says that the top 20​% of the class received an A on the last test. The scores were normally distributed with mean 66 and standard deviation 12.   Find the minimum score required to get an A.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A teacher says that the top 20​% of the class received an A on the last test. The scores were normally distributed with mean 66 and standard deviation
12.
 
Find the minimum score required to get an A.
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