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Mathematics, 26.11.2020 08:30 vmosley8648

Suppose that the departmental final exam scores are normally distributed with a mean of 72 and a standard deviation of 9. Grades (A, B, C, D, F) are assigned according to the rule below. The top 10% receive an A.

The next 20% receive a B.

The middle 40% receive a C.

The next 20% receive a D.

The bottom 10% receive an F.

Find the lowest final exam score for a student to receive:
an A
a C
a D

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