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 m

Question

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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Sarah 2 weeks 2022-01-08T08:42:45+00:00 1 Answer 0 views 0

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    2022-01-08T08:44:00+00:00

    Answer:

    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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45:7+7-4:2-5:5*4+35:2 =? ( )