下面哪个说法是对的？在序号上打“√”．
①一组数据中，改变两个数的大小，它的中位数一定变了．
②一组数据中，把一个数变大了，中位数和平均数都变大了．
③一组数据中，把一个数变小了，平均数也变小了．
④一组数据中，把一个数变大了，中位数也变大了．
相关试题
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= 54
=直接写出得数
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