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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？（）
品合格率指標(biāo)是（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
A cumulative frequency polygon is also called （）.
在組距數(shù)列中，下限就是（）
Descriptive statistics deals with methods of（）
常用的長(zhǎng)期趨勢(shì)測(cè)定的方法有哪些？各有什么特點(diǎn)？
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 （）.
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). The average number of absences per employee, calculated from the personnel data of all employees, is a （）.