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) About Me  (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.