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One advantage of a stem and leaf plot over a frequency distribution is that （）.
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
什么是季節(jié)變動？研究它的意義何在？如何測定季節(jié)變動？
對某班級學(xué)生的生活狀況進(jìn)行統(tǒng)計調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
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？（）
A cumulative frequency polygon is also called （）.
Which of the following statements is not true？（）
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%。假定全廠各級工資水平均無變化，則2019年職工總平均工資將（）
變量數(shù)列中，各組頻率之和應(yīng)（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間，這四個車間的廢品率分別為1.5%、2.0%、2.0%和1.0%。該企業(yè)生產(chǎn)這種產(chǎn)品的平均廢品率是多少？