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An examiner wishes to award A grades to 10% of students, B grades to 20% of...

An examiner wishes to award A grades to 10% of students, B grades to 20% of students, and C grades to the remainder. In order to achieve this, what grading bands should be used if exam marks are normally distributed with a mean of 60 and a standard deviation of 13?

Math   Statistics-And-Probability   
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Answer #1

The cutoff for A grade will be score that has 0.10 area to its right

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The cutoff for B grade will be score that has 0.30 area to its right and less than scores 76.64.

That is scores between 66.76 and 76.64 will have grade B.

Scores less than 66.76 will have grade C.

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