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為什么在計算平均指標的基礎上還有必要進一步計算變異指標？
某廠某年職工勞動生產率為20000元，是歷史最高水平的1.2倍。這里的1.2倍是（）
某班的學習按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
在組距數列中，下限就是（）
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？（）
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，則價格指數為（）
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？（）
某企業(yè)的生產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 class intervals in a frequency distribution is usually between （）.
Which of the following is not the goal of descriptive statistics?（）