SOLUTION: You have received test scores of 83, 75, 81, and 74 recently. You have to get a B- 80%average for the course. What must your fifth and final test score be to get this average?

Question 1016940: You have received test scores of 83, 75, 81, and 74 recently. You have to get a B- 80%average for the course. What must your fifth and final test score be to get this average?

Found 2 solutions by FrankM, Cromlix:
Answer by FrankM(1040) (Show Source): You can put this solution on YOUR website!
For 5 scores to average 80, they must total 400, as 5*80=400
83+75+81+74+X=400
X=87
Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
Hi there,
Total for first 4 tests:-
83 + 75 + 81 + 74
= 313
To get an average of 80 for fifth
and final test
Total must be 5 x 80
= 400
So, 400 - 313 = 87
A test score of 87 is required
to get an average of 80 overall.
Hope this helps :-)
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