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

A psychology 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 58% C: Scores below the top 42% and above the bottom 15% D: Scores below the top 85% and above the bottom 9% F: Bottom 9% of scores Scores on the test are normally distributed with a mean of 74.6 and a standard deviation of 7.8. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.

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