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

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.

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