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？（）

Which of the following statements is not true？（）

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（）

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 class intervals in a frequency distribution is usually between （）.

變量數(shù)列中，各組頻率之和應(yīng)（）

要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）

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？

If data are grouped into intervals and the number of items in each group is listed, this could be called a （）