Boris has scored 80, 93, 63, 83, and 83 on his previous five tests. what score does he need on his next test so that his average (mean) is 79?

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02-06-2018
Mathematics

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Boris has scored 80, 93, 63, 83, and 83 on his previous five tests. what score does he need on his next test so that his average (mean) is 79?

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BeaVechiato BeaVechiato · Answer 1 · 2018-06-02T10:15:20+02:00

BeaVechiato BeaVechiato

02-06-2018

current average = (80 + 93 + 63 + 83 + 83) / 5
= 402 / 5
= 80.4

79 x 6
= 474

what he needs to score on the next test = 474 - 402
= 72

{reassurance = (80 + 93 + 63 + 83 + 83 + 72) / 6
= 474 / 6
= 79}

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