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A certain data set consists of n values, and the mean of the values is positive. If an additional value equal to 70 percent of the mean is included in the data set to create a new data set, then the mean of the values in the new data set will be 2 percent less than the mean of the values in the original data set. What is the value of n?
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· 相关考点
5.2.1 平均值
5.2.1 平均值
以上解析由 考满分老师提供。
