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 （）.

One rule that must always be followed in constructing frequency distributions is that （）.

Which of the following statements is not true？（）

變量數(shù)列中，各組頻率之和應(yīng)（）

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

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（）

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

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 distribution would provide（）.