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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？（）
One advantage of a stem and leaf plot over a frequency distribution is that （）.
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于（）
If the individual class frequency is divided by the total frequency, the result is the （）.
The number of class intervals in a frequency distribution is usually between （）.
Descriptive statistics deals with methods of（）
最能反映離散程度的指標(biāo)是（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過(guò)四個(gè)車間，這四個(gè)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？
某廠某年職工勞動(dòng)生產(chǎn)率為20000元，是歷史最高水平的1.2倍。這里的1.2倍是（）
某班的學(xué)習(xí)按考試成績(jī)分為60分以下，60-70，70-80，80-90，90-100，這種分組（）