某企業(yè)2018年技術工占50%，2019年新招收了一批學徒工，使學徒工的比重增加了10%。假定全廠各級工資水平均無變化，則2019年職工總平均工資將（）

One advantage of a stem and leaf plot over a frequency distribution is that （）.

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（）

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（）

企業(yè)生產一種產品需順次經過四個車間，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)生產這種產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 （）.

某班的學習按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）

品合格率指標是（）

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