下面的數(shù)據(jù)文件顯示了在美國(guó)匹茲堡大學(xué)30名MBA考生的信息。第一列給出身高（英寸），第二列給出MBA剛剛就業(yè)后的月收入（數(shù)據(jù)來(lái)源于華爾街日?qǐng)?bào)，12月30日）
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為什么在計(jì)算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計(jì)算變異指標(biāo)？
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The number of class intervals in a frequency distribution is usually between （）.
A summary measure that is computed from a sample to describe a characteristic of the population is called（）
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？（）
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 （）.
One rule that must always be followed in constructing frequency distributions is that （）.
Which of the following statements is not true？（）
變量數(shù)列中，各組頻率之和應(yīng)（）