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一個地區(qū)一定時期的商品零售額屬于（）
在組距數(shù)列中，下限就是（）
品合格率指標(biāo)是（）
變量數(shù)列中，各組頻率之和應(yīng)（）
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour？（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
如果居民按報告期價格購買商品需多支出40萬元，報告期商品銷售額為200萬元，則價格指數(shù)為（）
某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組，請指出哪項是正確的（）
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class？（）