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What do you think of grading scheme

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Q: Grades on a midterm exam in a large biochemistry class are normally distributed with a mean of 75 and standard deviation of 9. The instructor wants to assign an A grade to the top 10% of scores, a B grade to the next 10%, and so on, with an F grade to all scores below the 60th percentile. For each letter grade, find the minimum score. What do you think of this grading scheme?

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