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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？（）
If the individual class frequency is divided by the total frequency, the result is the （）.
Which of the following statements is not true？（）
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(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（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
常用的長期趨勢(shì)測(cè)定的方法有哪些？各有什么特點(diǎn)？
在組距數(shù)列中，下限就是（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
The number of class intervals in a frequency distribution is usually between （）.