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A class of N=24 students took a quiz and scored a mean of 20.0. What is the new mean for the class when one student

A class of N=24 students took a quiz and scored a mean of 20.0. What is the new mean for the class when one student with a score of X=25 is added?

Then for the same class, of N=24 students took a quiz and scored a mean of20.0. What is the new mean for the class when two students with scores of X=9 are removed?

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