markjamesorgas markjamesorgas

13-12-2020
Mathematics

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How you express the average of five quizzes is 85 in mathematical expression

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connorcharonis connorcharonis

13-12-2020

Let x1, x2, x3, x4, x5 be the scores for the five tests respectively and y be the average score of those tests.

y = (x1 + x2 + x3 + x4 + x5) / 5

since y = 85:

(x1 + x2 + x3 + x4 + x5) / 5 = 85

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