Question 1044744: Marta's mean score for four science tests is 88. She scored 84, 87, and 91 on three of the tests. What was the score on the fourth test?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! mean=total/number
88=total/4
352=total
the three scores known are 84,87, and 91=262.
subtract from the new total, and 352-262=90
Check
test one is 4 below the mean, test 2 is 1 below, test 3 is 3 above, and to balance, test 4 must be 2 above. That would require it to be 90.
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