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An English professor assigns letter grades on a test according to the following scheme. A: Top 13% of scores B: Scores below the top 13%
An English professor assigns letter grades on a test according to the following scheme.
A: Top 13%
of scores
B: Scores below the top 13%
and above the bottom 61%
C: Scores below the top 39%
and above the bottom 22%
D: Scores below the top 78%
and above the bottom 6%
F: Bottom 6%
of scores
Scores on the test are normally distributed with a mean of 75.1
and a standard deviation of 9.1. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.
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