16 April, 06:23
A student of one of the authors earned grades of 63, 91, 88, 84, and 79 on her five regular statistics tests. She earned a grade of 86 on the final exam and 90 on her
class projects. Her combined homework grade was 70. The five regular tests count for 60%
of the final grade, the final exam counts for 10%, the project counts for 15%, and homework
counts for 15%. What is her weighted mean grade? What letter grade did she earn (A, B, C, D,
or F) ? Assume that a mean of 90 or above is an A, a mean of 80 to 89 is a B, and so on.
16 April, 07:49
Weighted mean grade: 81.2
Letter grade: B
5 regular tests:
(63+91+88+84+79) / 5 * 60%
= 405 / 5 * 0.6
86 * 10% = 8.6
90 * 15% = 13.5
70 * 15% = 10.5
So her weighted mean grade is
48.6 + 8.6 + 13.5 + 10.5 = 81.2
Know the Answer?
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» A student of one of the authors earned grades of 63, 91, 88, 84, and 79 on her five regular statistics tests. She earned a grade of 86 on the final exam and 90 on her class projects. Her combined homework grade was 70.