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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.
Indicate all such statements.
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以上解析由 考满分老师提供。
