最能反映離散程度的指標(biāo)是（）

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？

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 （）.

什么是季節(jié)變動？研究它的意義何在？如何測定季節(jié)變動？

一個地區(qū)一定時期的商品零售額屬于（）

A summary measure that is computed from a sample to describe a characteristic of the population is called（）

Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）

A cumulative frequency polygon is also called （）.

變量數(shù)列中，各組頻率之和應(yīng)（）