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23 April, 05:02

Amber's mean mark on five tests is 80.

Her marks on four of these tests are 68, 81, 74 and 89.

Work out her mark on the fifth test.

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Answers (2)
  1. 23 April, 07:17
    0
    88

    Step-by-step explanation:

    The mean is the total sum of all the marks divided by how many there are.

    68+81+74+89=312 Total of 4 tests

    80*5 = 400 Total marks on 5 tests

    400-312 = 88 Total marks on 5 tests - Total marks on 4 tests = 1 test

    68+81+74+89+88 = 400
  2. 23 April, 08:34
    0
    The answer is 88.

    Step-by-step explanation:

    68+81+74+89+x/5=80

    312+x/5=80

    312+x=80*5

    312+x=400

    x=400-312

    x=88
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