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最能反映離散程度的指標(biāo)是（）
The number of class intervals in a frequency distribution is usually between （）.
某班的學(xué)習(xí)按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）
A cumulative frequency polygon is also called （）.
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無變化，則2019年職工總平均工資將（）
If the individual class frequency is divided by the total frequency, the result is the （）.
在組距數(shù)列中，下限就是（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
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？（）
Which of the following is not the goal of descriptive statistics?（）