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，在大樣本情形下近似服從標(biāo)準(zhǔn)正態(tài)分布.
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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（）
Descriptive statistics deals with methods of（）
A cumulative frequency distribution would provide（）.
The number of class intervals in a frequency distribution is usually between （）.
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？（）
對(duì)全國各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查，以了解全國鐵路貨運(yùn)概況。這種調(diào)查屬于（）
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
在組距數(shù)列中，下限就是（）
Which of the following statements is not true？（）
Which of the following is not the goal of descriptive statistics?（）