證券分析人員為了研究資金運用效率對制造商收益的影響，隨機抽取了5個公司，得到如下資料：
要求計算：
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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). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a （）.
如果居民按報告期價格購買商品需多支出40萬元，報告期商品銷售額為200萬元，則價格指數(shù)為（）
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Which of the following is not the goal of descriptive statistics?（）
Which of the following statements is not true？（）
A cumulative frequency polygon is also called （）.
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？（）
一個地區(qū)一定時期的商品零售額屬于（）
在組距數(shù)列中，下限就是（）
企業(yè)生產(chǎn)一種產(chǎn)品需順次經(jīng)過四個車間，這四個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？