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【单选题】
下列关于组距数列中组中值说法错误的是( )。A.
上限和下限之间的中点数值
B.
用来代表各组标志值的平均水平
C.
在开放式分组中无法确定
D.
在开放式分组中,可以参照相邻组的组距来确定
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