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.

Question

Harper Robertson

Mathematics

19 July, 18:00

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.

+3

Answers (1)

Know the Answer?

Jared Terrell · Answer 1

Weighted mean grade: 81.2

Letter grade: B

Step-by-step explanation:

5 regular tests:

(63+91+88+84+79) / 5 * 60%

= 405 / 5 * 0.6

= 48.6

Final exam:

86 * 10% = 8.6

Project:

90 * 15% = 13.5

Homework:

70 * 15% = 10.5

So her weighted mean grade is

48.6 + 8.6 + 13.5 + 10.5 = 81.2