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A sociology professor assigns letter grades on a test according to the following scheme. A: Top 9% of scores B: Scores below the top 9%
A sociology professor assigns letter grades on a test according to the following scheme.
A: Top
9%
of scores
B: Scores below the top
9%
and above the bottom
63%
C: Scores below the top
37%
and above the bottom
24%
D: Scores below the top
76%
and above the bottom
7%
F: Bottom
7%
of scores
Scores on the test are normally distributed with a mean of
73.9
and a standard deviation of
9.9
. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.
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