單項(xiàng)選擇題在組距數(shù)列中,下限就是()

A.每個(gè)組的最小值
B.每個(gè)組的最大值
C.全距中的最大值
D.全距中的最小值


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1.單項(xiàng)選擇題某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組,請(qǐng)指出哪項(xiàng)是正確的()

A.80%~89%,90%~99%,100%~109%,110%以上
B.80%以下,80.1%~90%,90.1%~100%,100.1%~110%
C.90%以下,90%~100%,100%~110%,110%以上
D.85%以下,85%~95%,95%~100%,105%~115%

2.單項(xiàng)選擇題變量數(shù)列中,各組頻率之和應(yīng)()

A.小于1
B.等于1
C.大于1
D.不等于1

5.多項(xiàng)選擇題某班的學(xué)習(xí)按考試成績(jī)分為60分以下,60-70,70-80,80-90,90-100,這種分組()

A.是等距分組
B.第一組假定下限是0
C.相鄰組限是重疊的
D.分組標(biāo)志為連續(xù)型變量
E.某學(xué)生的成績(jī)80分應(yīng)歸在70-80這一組

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