SOLUTION: a student get a score of 72, 84, 86 what score must the student receive in the fourth test so that the mean of these scores will be 85

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Question 609282: a student get a score of 72, 84, 86 what score must the student receive in the fourth test so that the mean of these scores will be 85
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
a student get a score of 72, 84, 86 what score must the student receive in the fourth test so that the mean of these scores will be 85
:
let x = 4th test score
:
%2872%2B84%2B86%2Bx%29%2F5 = 85
multiply both sides by 5, then solve for x