简述次数分布数列的概念及构成要素。
(1)将总体按某一标准进行分组,并按一定顺序排列与列出每个组的总体单位数,这种数列称为次数分布数列,又称分配数列。(2)分布数列有两个组成要素:一个是分组,另一个是次数。
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