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The student will do 9 quizzes in all and must have a mean score of 90. So his total score from 9 quizes must be 90*9 = 810

The student has scored 715 in 8 quizzes so he needs 810-715 = 95 in his last quiz.

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Q: A student must have a mean score of 90 on his math quizzes to earn an A So far he has received grads of 88 85 91 92 94 81 86 and 98 what grade must he earn on his final quiz how do you find the answer?
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