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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
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A cumulative frequency polygon is also called （）.
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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 cumulative frequency of the third class？（）
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One rule that must always be followed in constructing frequency distributions is that （）.