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某汽車交易市場共發(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
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（）來測度這一集中趨勢比較合適。
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)
最新試題
要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于（）
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 （）.
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？（）
對某班級學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
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（）
One rule that must always be followed in constructing frequency distributions is that （）.
A cumulative frequency polygon is also called （）.
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.
Which of the following is not the goal of descriptive statistics?（）