A cumulative frequency polygon is also called （）.

對某班級學生的生活狀況進行統(tǒng)計調(diào)查，下列標志中屬于不變標志的是（）

If the individual class frequency is divided by the total frequency, the result is the （）.

A cumulative frequency distribution would provide（）.

為什么在計算平均指標的基礎(chǔ)上還有必要進一步計算變異指標？

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

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 （）.

在組距數(shù)列中，下限就是（）

一個地區(qū)一定時期的商品零售額屬于（）

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？