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For a group of 9 steel beams stored together, the average(arithmetic mean) length of the beams is 7.2 meters and the median length is 8.4 meters. Two additional steel beams-one that is longer than all 9 beams and one that is shorter than all 9 beams-will be stored with the 9 beams. For the combined group of 11 steel beams, the average length is m meters and the median length is d meters. Which of the following statements must be true.
Indicate all such statements.
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当前版本由 354261qil 更新于2024-07-04 16:30:42 感谢由 354261qil 对此题目的解答所做出的贡献。
增加了一个最短的和一个最长的，由于具体的长度未知，所以对于平均数的影响也未知；但是由于不影响排名，所以中位数是不会变的。
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