SOLUTION: Here is another one 1. Brook has scored a 65, 72, 74, 84 and 94 on previous tests, what does she need to score to receive an 80 average? Thank you in advance

Algebra ->  Inequalities -> SOLUTION: Here is another one 1. Brook has scored a 65, 72, 74, 84 and 94 on previous tests, what does she need to score to receive an 80 average? Thank you in advance       Log On


   

Question 853309: Here is another one
1. Brook has scored a 65, 72, 74, 84 and 94 on previous tests, what does she need to score to receive an 80 average?
Thank you in advance


Answer by Seutip(231) About Me  (Show Source):
You can put this solution on YOUR website!
Mean Average is sum divided by the count.
Let x - be the score she needs to get 80.
Therefore,
%2865%2B72%2B74%2B84%2B94%2Bx%29%2F6=80
%28389%2Bx%29%2F6=80 Then multiple both sides by 6
389%2Bx=480
x=91
Therefore to get a mean average of 80, Brook must get a score of 91!

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