SOLUTION: Austin has scored 81, 86,89 ,81 , and 64 on his previous five tests. What score does he need on his next test so that his average (mean) is 81?
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Question 779015: Austin has scored 81, 86,89 ,81 , and 64 on his previous five tests. What score does he need on his next test so that his average (mean) is 81?
Answer by 1412(5) (Show Source): You can put this solution on YOUR website!
the mean for all the six tests is 81 which is (401 + x)/6
where x is the score that needed to get 81 average
now
(401 + x)/6 = 81
solve it for x you will get x = 85 #end
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