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Erin's math test scores are 93, 78, 89, 83, and 83. She has one more math test this semester. What score must she get on the test to have a mean score of 85?

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Answer:

84

Explanation:


\displaystyle (93+78+89+83+83+x)/(6)=85\\\\\displaystyle 426+x=510\\\\x=84

Therefore, Erin would need to score an 84 on her last test to get a mean score of 85.

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