SOLUTION: A student has a mean average grade of 89 on 9 tests. What must she make on the tenth test to have an average of 90?

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Question 908286: A student has a mean average grade of 89 on 9 tests. What must she make on the tenth test to have an average of 90?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
He missed 90 nine times
He needs 90+9 to get an average of 90