Question 794537
the mean grade on 4 test is 78%. can the mean be raised 
to 85% with one more test?
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Equations:
Total points from 1st 4 tests = 4*78 = 312
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Total points needed on 5 tests = 5*85 = 425
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Points needed on the 5th test = 425-312 = 113
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Ans: 113 points cannot be gotten on one 100 point test.
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Cheers,
Stan H.
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