73. 一堆鸟人,30岁以下有136人,30到40岁的有49人,40岁以 上有76人,问这堆人年龄的中数可能是:A:27 B:32 C:34 D:38 E:42 答案选A.数字可 能不太准确,最重要的是中数(median)的概念 Lee:只能是
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