Analyzing Test Scores
A college professor decided to grade his tests on a curve using the following criteria.
2 or more SD's above mean 
A 
11.99 SD's above mean 
B 
00.99 SD's above mean 
C 
00.99 SD's below mean 
C 
11.99 SD's below mean 
D 
2 or more SD's below mean 
F 
Given the following stemandleaf plot, find out how many students will receive each grade.
5 
5 9 
6 
8 
7 
3 4 9 
8 
2 5 5 5 7 8 8 8 
9 
1 1 1 5 7 9 
Extension: Based on a 10point scale where 90100 is an A, 8089 is a B, 7079 is a C, 6069 is a D and below 59 is an F, is this professor's curve fair or unfair? Who benefits from the curve? Who is hurt by the curve?
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