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The average (arithmetic mean) of the measurements in a large sample is 46.2. The average of the greatest 30 percent of the measurements is 56.5, and the average of the least 30 percent of the measurements is 30.5. What is the average of the remaining 40 percent of the measurements?
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5.2.1 平均值
5.2.1 平均值
以上解析由 考满分老师提供。
