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【多选题】
在组距式数列中,组中值是(   )。
A.
上限与下限之间的中点数
B.
在开口组中无法确定
C.
是用来代表各组标志值的平均水平
D.
在开口组中可参照邻组组距来确定
E.
就是组内变量值的平均数
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