Sasha wants to know her average grade on her math tests. She earned a score of 70 on two tests, an 80 on one test, and a 90 on two tests. What is Sasha’s mean score?

There are five tests total: two scores of 70, one score of 80, and two scores of 90. Their total is 70 + 70 + 80 + 90 + 90 = 400, and 400 ÷ 5 = 80. Sasha’s mean score is 80, choice C.

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