Question

The mean mark in Statistics of 100 students in a class was 72. The mean mark of boys was 75. While their number was 70. The mean mark of girls in the class was:

• A. 69
• B. 60
• C. 66
• D. 62
• E. 65

Answer 1

Answer: (E)

Total marks of 100 students = 7200 Total marks of 70 boys $=70\times 75=5250$ $\therefore$ Total marks of 30 girls $=7200-5250=1950$ $\therefore$ $Mean=\frac{1950}{30}=65$