A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is

1. 

A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is
[A]. 0.9
[B]. 10/9
[C]. 0.81
[D]. 0.1

Answer: Option B

Explanation:

Calling rate is the number of calls per subscriber.

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