单项选择题
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
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相关考题
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单项选择题
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 -
单项选择题
A cumulative frequency distribution would provide（）.
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 -
单项选择题
Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）
A.histogram
B.ogive
C.stem and leaf chart
D.pie chart
