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A class of 12 students has taken an exam, and the mean of their scores is 71. One student takes the exam late, and scores 92. After including the new score, what is the mean score for all 13 exams?
8 years ago

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Answered by Steve
(12*71 + 92)/13 = 72 8/13

Note that 92 = 71 + 13+8
8 years ago
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A class of 12 students has taken an exam, and the mean of their scores is 71. One student takes the exam late, and scores 92. After including the new score, what is the mean score for all 13 exams?

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