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You scored 88, 92, and 87 on three tests. Write and solve an equation to fi nd the score you need on the fourth test so that your mean test score is 90.
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You scored 88, 92, and 87 on three tests. Write and solve an equation to fi nd the score you need on the fourth test so that your mean test score is 90.

User SteveR
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1 Answer

6 votes
(88+92+87+n)/4 = 90
4 x (88+92+87+n)/4 = 90 x 4
267 + n = 360
267 + n - 267 = 360 - 267
n = 93
User Jacek Pietal
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