SOLUTION: On his first 5 biology tests, Bob received the following scores: 72, 86, 92, 63, and 77 What test score must Bob earn on his sixth test so that his average (mean score) for

SOLUTION: On his first 5 biology tests, Bob received the following scores: 72, 86, 92, 63, and 77 What test score must Bob earn on his sixth test so that his average (mean score) for

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Question 1001289: On his first 5 biology tests, Bob received the following scores:
72, 86, 92, 63, and 77
What test score must Bob earn on his sixth test so that his average (mean score) for all six tests will be 80?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
To average 80 on six tests he will need to total 6(80) = 480 points.
So far he has
72 + 86 + 92 + 63 + 77 = 390 points.
Thus he needs 480-390 = 90 on the next exam.
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