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7 September, 05:34

In a class of 32 students

the mean height of 14 boys is 1.56

the mean height of all 32 students is 1.515

work out the mean height of the girls

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  1. 7 September, 07:46
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    Number of girls = 32 - 14 = 18

    Total height of all the 32 students = 1.515 x 32 = 48.48

    Total height of the 14 boys = 14 x 1.56 = 21.84

    Total height of the 18 girls = 48.48 - 21.84 = 26.64

    Mean height of the 18 girls = 16.84 : 18 = 1.48

    Answer: 1.48
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