SOLUTION: Keith has scored 84,75,81, and 80 on his previous four tests. What score does he need on his next test so that his average (mean) is 83?

Algebra ->  Average -> SOLUTION: Keith has scored 84,75,81, and 80 on his previous four tests. What score does he need on his next test so that his average (mean) is 83?       Log On


   

Question 915837: Keith has scored 84,75,81, and 80 on his previous four tests. What score does he need on his next test so that his average (mean) is 83?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x the score he needs
(84+75+81+80 +x)/5 = 83
x = 415 - (84+75+81+80)