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10 June, 08:11

The mean mark is 70% there are 30 students 20 of which are boys with a mean mark if 62% what is the mean for girls

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  1. 10 June, 08:26
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    This problem can be solved by working backwards.

    Average of 30 students = 70.

    Total marks of all the 30 students = 30x70 = 2100

    Out of these 30, average of 20 students = 62

    Total marks of these 30 students = 30x62 = 1860

    So the total marks of the remaining 10 students = 2100-1860 = 240

    Hence the average of the remaining 10 students = 240/10 = 24
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