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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？（）
A.80
B.200
C.20
D.100
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 cumulative frequency of the third class？（）
A.80
B.0.40
C.155
D.75
A.a graph of a frequency distribution
B.a running total of the frequencies in the classes
C.the proportion of the total frequencies which fall into each class
D.a very cloudy picture of the frequencies
A.histogram
B.ogive
C.stem and leaf chart
D.pie chart
最新試題
One rule that must always be followed in constructing frequency distributions is that （）.
If the individual class frequency is divided by the total frequency, the result is the （）.
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 advantage of a stem and leaf plot over a frequency distribution is that （）.
變量數(shù)列中，各組頻率之和應(yīng)（）
If data are grouped into intervals and the number of items in each group is listed, this could be called a （）
對(duì)某班級(jí)學(xué)生的生活狀況進(jìn)行統(tǒng)計(jì)調(diào)查，下列標(biāo)志中屬于不變標(biāo)志的是（）
A cumulative frequency polygon is also called （）.
一個(gè)地區(qū)一定時(shí)期的商品零售額屬于（）
The number of class intervals in a frequency distribution is usually between （）.