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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
A.the number of classes must be less than 10
B.each data point can only fall into one class
C.the width of each class is equal to the range
D.the number of intervals must be an odd number
最新試題
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？
變量數(shù)列中，各組頻率之和應(yīng)（）
Which of the following is not the goal of descriptive statistics?（）
要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）
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 （）.
A cumulative frequency polygon is also called （）.
一個地區(qū)一定時期的商品零售額屬于（）
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？（）
對某班級學(xué)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（）
The number of class intervals in a frequency distribution is usually between （）.