某学校高三年级有学生500人其中男生300名女生200名为了研究学生的数学成绩是否与性别有关现采用分层抽样的方法从中抽取了100名 Template




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tomski某学校高三年级有学生500人其中男生300名女生200名为了研究学生的数学成绩是否与性别有关现采用分层抽样的方法从中抽取了100名 coloring