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imc

prealgebra junior

Problem

The quiz scores of a class with students have a mean of . The mean of a collection of of these quiz scores is . What is the mean of the remaining quiz scores in terms of ?
(A)
(B)
(C)
(D)
Solution
The total score of the class is and the total score of the quizzes is Therefore, for the remaining quizzes ( of them), the total score is Their mean score is
Final answer
B