Fifteen (15) accounting majors had an average grade of 90 on a finance exam. Twenty-five (25) marketing majors scored an average grade of 70 and Ten (10) finance majors scored an average grade of 85 on the same exam. The weighted mean grade for all of the students taking this exam (accounting, marketing, and finance students) is .

79

Explanation:

Number of accounting majors = 15

Average grade = 90

Meaning that the total grade of accounting majors = 15*90 = 1350

Number of marketing majors = 25

Average grade = 70

Meaning that the total grade of marketing majors = 25*70 = 1750

Number of finance majors = 10

Average grade = 85

Meaning that the total grade of finance majors = 10*85 = 850

This means that total number of student taking the exam = 15 + 25 + 10 = 50

Total grade of all students = 1350 + 1750 + 850 = 3950

Weighted mean grade = Total grade of all students/total number of students

= 3950/50 = 79

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