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?

Question

Mathematics

Levi Daugherty

19 February, 18:12

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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Answers (1)

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Mateo Hanna · Answer 1

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.