SOLUTION: After 6 exams, Carl has a mean score of 78.5. With only one exam remaining in the class, what is the minimum score Carl will need on that exam to have an overal mean of 80?

Question 953500: After 6 exams, Carl has a mean score of 78.5. With only one exam remaining in the class, what is the minimum score Carl will need on that exam to have an overal mean of 80?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
With a mean of 78.5 after 6 exams, the sum of his exam scores is (6)(78.5)=471. To average 80 over 7 exams, the sum of scores must be (7)(80)=560. On the final test, he must score 560-471=89. He must score a minimum of 89 to have an overall mean 0f 80.
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