SOLUTION: Wayne had the following scores on the first eight tests: 76, 77, 79, 91, 82, 84, 85, 53. What minimum score must Wayne earn to have a test average of 80?
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Question 411983: Wayne had the following scores on the first eight tests: 76, 77, 79, 91, 82, 84, 85, 53. What minimum score must Wayne earn to have a test average of 80?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
To take the average, you add up all of the numbers and divide by the number of numbers. Given that, if you multiply the average by the number of numbers, you must have the sum of all of the numbers. So, if you want to have an average of 80 over 9 tests, you multiply 9 times 80 and that will give you the sum you must achieve. Add up the scores that you already have and subtract from 9 times 80 to get the score you have to achieve to make an 80 average.
John
My calculator said it, I believe it, that settles it
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