SOLUTION: A student has an average score of 88 in her math class. This is the average of her first five math tests. What must she score on the sixth test in order to have a mean score of 9

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Question 941894: A student has an average score of 88 in her math class. This is the average of her first five math tests. What must she score on the sixth test in order to have a mean score of 90?
Am I close in how to solve this? I know I am missing something but not sure what?
90*6=540
88*5=440
subtract and you get 100. Would that be her needed score????

Thank you
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
what you have done is perfectly right
Result: the score should be 100 on the sixth test