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An English professor assigns letter grades on a test according to the following

An English professor assigns letter grades on a test according to the following scheme.

A: Top 14% of scores

B: Scores below the top 14% and above the bottom 57%

C: Scores below the top 43% and above the bottom 24%

D: Scores below the top 76% and above the bottom 8%

F: Bottom 8% of scores

Scores on the test are normally distributed with a mean of 69.6 and a standard deviation of 9. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.

Feb 06 2020 View more View Less

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