Question

An instructor has graded 23 exam papers submitted by students in a class of 24 students, and the average so far is 75. (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

Answer 1

Answer: The last paper has to be 99 over 100 to move the class average by 1 point

Explanation:

total points on the 23 exams: 23*75 = 1725

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For 24 papers to average 76 points you need 24*76= 1824

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Score on the final paper would have to be (1824-1725) = 99