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6 April, 23:06

The mean mark for the class was 70%. There are 30 students in the class, 20 of whom are boys. The mean mark for the boys is 62%. What is the mean mark for the girls?

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  1. 7 April, 00:45
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    Mean mark for the class = 70%

    Total marks for the class = 70 x 30 = 2100

    Mean mark for the boys = 62%

    Total marks for the boys = 62 x 20 = 1240

    Total marks for the girls = 2100 - 1240 = 860

    Mean marks for the girls = 860 : 10 = 86%

    Answer: 86%
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