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In: Statistics and Probability

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

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

A: Top 15% of scores

B: Scores below the top 15% and above the bottom 64%

C: Scores below the top 36% and above the bottom 21%

D: Scores below the top 79% and above the bottom 8%

F: Bottom 8% of scores

Scores on the test are normally distributed with a mean of 76.5 and a standard deviation of 8.4. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.

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TOPIC:Normal distribution.

orchestra answered 2 years ago
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