SOLUTION: Suppose your grades on your first four exams were 84%, 90%, 68%, and 89%. What would be the lowest possible average that your last two exams could have so that your grade in the cl

SOLUTION: Suppose your grades on your first four exams were 84%, 90%, 68%, and 89%. What would be the lowest possible average that your last two exams could have so that your grade in the cl

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Question 261605: Suppose your grades on your first four exams were 84%, 90%, 68%, and 89%. What would be the lowest possible average that your last two exams could have so that your grade in the class, based on the average of the six exams, is at least 78%?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
(84+90+68+89+2X)/6>=78
(331+2X)/6>=78
331+2X>=6*78
331+2X>=468
2X>=468-331
2X>=137
X>=137/2
X>=68.5 OR THE LAST 2 TESTS MUST AVERAGE 68.5 OR GREATER.
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