Astudent 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.