Question: Please explain why would you use certain formula and why 5. Suppose calls are arriving at a telephone exchange at an average rate of one

Please explain why would you use certain formula and why 5. Suppose calls are arriving at a telephone exchange at an average rate of one per second, according to a Poisson arrival process. Find: a) the probability that the fourth call after time t = 0 arrives within 2 seconds of the third call; b) the probability that the fourth call arrives by time t = 5 seconds: c) the expected time at which the fourth call arrives

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