In a course where the mean final exam grade is 68 with a standard deviation of 6.5, the grading scheme is as follows: The top 20% get As, next 25% get Bs, next 25% get Cs, next 10% get Ds, and the rest get Fs.  Assume that the scores are normally distributed.   What exam grade is the cutoff (minimum needed) for an A?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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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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In a course where the mean final exam grade is 68 with a standard deviation of 6.5, the grading scheme is as follows:

The top 20% get As, next 25% get Bs, next 25% get Cs, next 10% get Ds, and the rest get Fs. 

Assume that the scores are normally distributed.

 

What exam grade is the cutoff (minimum needed) for an A?

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