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Question

The number of phone calls arriving at a switchboard each hour has been recorded, and the following frequency distribution has been developed.
Class IntervalFrequency
20-under 4030
40-under 6045
60-under 8080
80-under 10045

What is the cumulative frequency of the third class?
a) 80
b) 0.40
c) 155
d) 75
e) 105

Answer

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