SOLUTION: if I made a 78, 65, 82, 91, and an 88 on my last five tests what do I need to make on the next one to have an average of a 77?

SOLUTION: if I made a 78, 65, 82, 91, and an 88 on my last five tests what do I need to make on the next one to have an average of a 77?

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Question 832339: if I made a 78, 65, 82, 91, and an 88 on my last five tests what do I need to make on the next one to have an average of a 77?
Answer by thejackal(72) (Show Source): You can put this solution on YOUR website!
lets call the sixth test result n
((78+65+82+91+88)+n)/6 = 77
(404+n)/6 = 77
404+n = 462
n = 462 - 404 = 58
you need exactly 58 marks/score on your sixth test to make an average of 77

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