SOLUTION: Michelle's mean score on eight math quizzes is 89 what must she score on her next quiz to raise her mean score to exactly 90
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Question 1070280: Michelle's mean score on eight math quizzes is 89 what must she score on her next quiz to raise her mean score to exactly 90 Answer by Theo(13342) (Show Source):
You can put this solution on YOUR website! in order to score an average of 90 on 9 quizzes, she has to have a total score of 90 * 9 = 810.
she has a total of 8 * 89 = 712 on 8 quizzes.
810 - 712 = 98.
she needs to score a 98 on the 9th test in order to get an overall average of 90 on all 9 tests.
