Question 671355
 Leon must have made a mean score of 90 on his math quizzes to earn an A. So far, he has received grades of 88,85,91,92,94,81,86,98. What grade must he earn on his final quiz?]
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His final quiz will be his 9th quiz.
To average 90 he needs 9*90 = 810 points
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He needs 810-(88+85+91+92+94+81+86+98) = 95 on his 9th quiz
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Cheers,
Stan H.