SOLUTION: Heather's test scores are 81,93,74,and 95, What is the score she must earn on the next test in order to get a mean of 85 on the five tests?

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Question 586453: Heather's test scores are 81,93,74,and 95, What is the score she must earn on the next test in order to get a mean of 85 on the five tests?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = the score Heather must get on the fifth test to obtain a mean of 85 on the five tests.
This means that the average (mean) of the five tests is to be 85, so we find the average of the five test scores in the usual way: The sum of the scores divided by the number of scores.
%2881%2B93%2B74%2B95%2Bx%29%2F5+=+85
%28343%2Bx%29%2F5+=+85 Multiply both sides by 5.
343%2Bx+=+425 Subtract 343.
x+=+82
Heather will need to score 82 on her fifth test to get an overall average of 85 for the five tests.