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ZX-DF66C8E050Distributions and measures of center and spread · 第 13 题
Distributions and measures of center and spread · 原库模块 1 · Q13 原库参考解析
Data set A consists of the heights of 75 objects and has a mean of 25 meters. Data set B consists of the heights of 50 objects and has a mean of 65 meters. Data set C consists of the heights of the 125 objects from data sets A and B. What is the mean, in meters, of data set C ?
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