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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
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 （）.
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？（）
某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組，請指出哪項是正確的（）
為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進一步計算變異指標(biāo)？
某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)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（）
品合格率指標(biāo)是（）
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（）.
變量數(shù)列中，各組頻率之和應(yīng)（）