SOLUTION: You have a mean score of 84 after taking five 100-point tests. What do you need to score on the sixth 100-point test to have a mean score of 85?
I tried: 84+x/2=85
2(84+x/2)=
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-> SOLUTION: You have a mean score of 84 after taking five 100-point tests. What do you need to score on the sixth 100-point test to have a mean score of 85?
I tried: 84+x/2=85
2(84+x/2)=
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Question 359671: You have a mean score of 84 after taking five 100-point tests. What do you need to score on the sixth 100-point test to have a mean score of 85?
I tried: 84+x/2=85
2(84+x/2)=(85)(2)
84-84+x=170-84
x=86
The problem is that I have multiple choice answers and 86 is not one of the answers (the answers are: A. 85 B. 89 C. 90 D. 92 Answer by ewatrrr(24785) (Show Source):
Hi,
Let x represent the score on the sixth test
Mean = sum of scores/number of tests
84 = S/5 test Therfore 5*84 = 420 is the sum of the first five tests
(420 + x)/6 = 85
420 + x = 510
x = 90
