SOLUTION: I have 5 students tool and algebra test, the average score was 84, Four of the scores were 96.68.79 and 85. What did the 5th student score? Thanks

Algebra ->  Average -> SOLUTION: I have 5 students tool and algebra test, the average score was 84, Four of the scores were 96.68.79 and 85. What did the 5th student score? Thanks      Log On


   

Question 662452: I have 5 students tool and algebra test, the average score was 84, Four of the scores were 96.68.79 and 85. What did the 5th student score?
Thanks
Found 3 solutions by MathLover1, ReadingBoosters, lynnlo:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

let x be the 5th student score

%2896%2B68%2B79%2B85%2Bx%29%2F5=84

%28328%2Bx%29%2F5=84

328%2Bx=84%2A5

328%2Bx=420

x=420-328

x=92........the 5th student score




Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
To calculate the average use the following understanding:
average = sum of test / number of tests
In this case figure out the average with the following equation:
84 = (96+68+79+85 + x)/5
Multiply both sides by 5
420 = 328 + x
Subtract 328 from both sides
92 = x
The fifth test score was 92

Answer by lynnlo(4176) About Me  (Show Source):
You can put this solution on YOUR website!
96+68+79+85+92=420 divided by 5 test=84 average