下面的數(shù)據(jù)文件顯示了在美國匹茲堡大學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)來源于華爾街日報，12月30日）
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A summary measure that is computed from a sample to describe a characteristic of the population is called（）
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變量數(shù)列中，各組頻率之和應（）
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A cumulative frequency polygon is also called （）.
在組距數(shù)列中，下限就是（）
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One advantage of a stem and leaf plot over a frequency distribution is that （）.