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A class of 18 students took an exam and the average (mean) score was 75, with a standard deviation of 10 points. Th next

A class of 18 students took an exam and the average (mean) score was 75, with a standard deviation of 10 points. Th next day, George took the exam and scored 89. What was the new mean score for the class, including George? Did the standard deviation change? If so, will the new standard deviation be greater, or smaller?

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