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Statistics

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An instructor has graded 25 exam papers submitted by students in a class of 26 students, and the average so far is 71. (The maximum possible score is 100.)

A) To raise the class average by 1 point, the score on the last paper has to be:

  • Statistics - ,

    71 = S/25 so S = 1775 the present sum of all scores after 25 grades

    72 (26) = (1775+x)

    1872 = 1775 + x

    x = 97

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