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OpenStudy (anonymous):
xhai.o5 Jake had grades of 92,90,85 and 88 on five math test . What grade must he get on the 5th test to have an average of 90 ?
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OpenStudy (rob1525):
Okay so the fifth test score is unknown so lets say its x. To find the average you add all the test scores divided by the number of test scores. so... (92+90+85+88 +x)/5=90 now solve for x.
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