The Erlang B formula computes the probability that a customer is lost from an M/M/c/c queue because all the servers are busy. For example, if there are 30 call lines and the traffic is 25 Erlangs, then the blocking or loss probability is approximately 0.05.
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Study the variation of the loss probability for different numbers of lines.
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Calculate the number of lines required, given the traffic and blocking probability.