SOLUTION: Charlie must take four exams in his finite math class. His scores on his first three exams are 91, 77, and 83. What must he score on his fourth exam if he wants his overall mean

Question 647863: Charlie must take four exams in his finite math class. His scores on his first three exams are 91, 77, and 83. What must he score on his fourth exam if he wants his overall mean to be at least 80?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
His scores on his first three exams are 91, 77, and 83. What must he score on his fourth exam if he wants his overall mean to be at least 80?
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Solve:
(91 + 77 + 63 + x)/4 >= 80
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(231+x) >= 320
x >= 89
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Cheers,
Stan H.
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