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  4. 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:

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Q. 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:

KEAMKEAM 2000

Solution:

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 $