Teletraffic engineering/Blocking/Answer1

We have first to find the busy-hour traffic. BHT = 167 Erlangs using Little's Rule.

According to Little's Rule: For the hour, the traffic in Erlangs = ${\frac {Numberofcalls*MeanHoldingTime(seconds)}{3600}}$

Using the Erlang-B formula is cumbersome in this example because there are many circuits. An Erlang-B calculator is used instead. The Blocking Probability is found to be 0.021 (2.1%)

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