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【多选题】
在变量数列中( )。A.
在总体单位数确定的条件下,频数和频率成反比
B.
频率、频数统称为次数
C.
各组的频数之和等于100
D.
各组频率大于0,频率之和等于1
E.
频数越小,则该组的标志值所起的作用越小
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