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15 December, 15:27

A group of students take a test. The group consists of 12 boys and 8 girls.

The mean mark for the boys is 18

The mean mark for the girls is 16.5

Calculate the mean mark for the whole group.

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Answers (1)
  1. 15 December, 17:32
    0
    17.4

    Step-by-step explanation:

    Sum = mean * no. of observations

    Sum of boys:

    12 * 18 = 216

    Sum of girls:

    8 * 16.5 = 132

    Total = 216 + 132 = 348

    Mean: 348/20

    = 17.4
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