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17 February, 22:15

Rueben has scored 81, 89, 90, 83, and 77 on his previous five tests. what score does he need on his next test so that his average (mean) is 82?

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  1. 18 February, 01:58
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    Let x = the next score

    If (81 + 89 + 90 + 83 + 77 + x) : 6 = 82

    ⇒ 420 + x = (82 * 6)

    ⇒ x = 492 - 420

    x = 72

    Thus to get an 82 average he need to get 72 on his next test.
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