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The Poisson distribution
Modifications for telephone traffic
4 other sections not shown
arrival rate assumed automobile repair shop average frequency bability Beckmann blocking probability busy channels calculation call rate cars channels are busy clearing blocked calls compute constant continuous random variable curves cust customer arrivals customer demand delay probability delay system delayed customers efficiency equal equation equipment Erlang Erlang Distribution example exponential distribution exponential with mean find the probability formula given Golem Press holds blocked calls independent interval dt load offered load submitted loss probability loss system mean holding mean number minutes number of busy number of channels number of customers number of trunks obtain offered calls offered load omer operation order of service overflow group overload Petr Beckmann Poisson distributed preceding chapter probability density Probability Theory problem queue Queuing Theory random order repair served service completion service system shown in Fig subscriber substituting Table tele telephone facility telephone traffic total number trunk group trunk lines