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對(duì)全國(guó)各鐵路交通樞紐的貨運(yùn)量、貨物種類(lèi)等進(jìn)行調(diào)查,以了解全國(guó)鐵路貨運(yùn)概況。這種調(diào)查屬于()
最能反映離散程度的指標(biāo)是()
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 ().
One advantage of a stem and leaf plot over a frequency distribution is that ().
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(guò)四個(gè)車(chē)間,這四個(gè)車(chē)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?
什么是季節(jié)變動(dòng)?研究它的意義何在?如何測(cè)定季節(jié)變動(dòng)?
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?()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
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(kāi)()