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Standard Deviation and mean of Class Grades

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For F2006 the MAT540
Number of Students earning each letter grade was

Grades in Last Terms Number
A 117
B 140
C 101
F 57

If this term is representative of each terms performance what is the probability of a student receiving each grade?

Calculate the mean and standard deviation
if A=4, etc.

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Solution Summary

The calculations to find the standard deviation and the mean of class grades is given in the solution.

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The total number of students = 117 + 140 + 101 +57 = 415
Then Prob(A) = 117 / 415 = 28.19%
Prob(B) = ...

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