Find the numerical limits for a d grade

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

A: Top 8% of scores

B: Scores below the top 8% and above the bottom 60%

C: Scores below the top 40% and above the bottom 18%

D: Scores below the top 82% and above the bottom 9%

F: Bottom 9% of scores

Scores on the test are normally distributed with a mean of 67.7 and a standard deviation of 8.5. Find the numerical limits for a D grade. Round your answers to the nearest whole number, if necessary.

Reference no: EM132474110

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