SOLUTION: An instructor has graded 22 exam papers submitted by students in a class of 23 students, and the average so far is 68. (The maximum possible score is 100.) How high would the score

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Question 1107373: An instructor has graded 22 exam papers submitted by students in a class of 23 students, and the average so far is 68. (The maximum possible score is 100.) How high would the score on the last paper have to be to raise the class average by 1 point?
2 points?
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
%2868%2A22+%2B+x%29%2F23 = 69.


Solve for x.


I do not explain why it is so, because I think the formula itself displays it.

You only need to read it.

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On this sort of problems see the lesson
    - Solved problems on average scores, weight, height and temperature
in this site.