某汽車交易市場(chǎng)共發(fā)生了150項(xiàng)交易，將銷售記錄按付款方式及汽車類型加以區(qū)分如下：
如果從銷售記錄中隨機(jī)抽取一項(xiàng)，該項(xiàng)是分期付款的概率是（）
A.0.95
B.0.5
C.0.8
D.0.25
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五位部門經(jīng)理的年收入如表：
要描述五位部門經(jīng)理的年收入的一般水平, 用（）來測(cè)度這一集中趨勢(shì)比較合適。
A.眾數(shù)
B.中位數(shù)
C.平均數(shù)
D.極差
A.A與B相互獨(dú)立
B.A與B不獨(dú)立
C.A與B相互排斥
D.A與B相關(guān)
A.統(tǒng)計(jì)資料的收集和分析
B.理論統(tǒng)計(jì)和運(yùn)用統(tǒng)計(jì)
C.統(tǒng)計(jì)預(yù)測(cè)和決策
D.描述統(tǒng)計(jì)和推斷統(tǒng)計(jì)
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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 cumulative frequency of the third class？（）
如果居民按報(bào)告期價(jià)格購(gòu)買商品需多支出40萬(wàn)元，報(bào)告期商品銷售額為200萬(wàn)元，則價(jià)格指數(shù)為（）
A cumulative frequency polygon is also called （）.
品合格率指標(biāo)是（）
時(shí)間序列構(gòu)成因素有哪些？分解的基本原理和思路是什么？
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？（）
在組距數(shù)列中，下限就是（）
A cumulative frequency distribution would provide（）.
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 （）.
以2000年a0為最初水平，2016年an為最末水平，計(jì)算鋼產(chǎn)量的年平均發(fā)展速度時(shí)，須開（）