Question 1005119
Sonya has mean average of 77.6 on the first five of the six test.to get an overall test average of 83 what must Sonya score on the sixth test ?
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If all tests count the same:
(5*77.6 + Test6)/6 = 83
388 + Test6 = 498
Test6 = 110
Good luck with that.
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PS  "mean average" is redundant.
mean = average --> "average average"
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From The Dept. of Redundancy Dept.