X = the number of occurrences of a particular event in an interval of time or space. 2x. e-1 P(X = x) : X = 0, 1, 2, 3, ... . x! E(X) = 2, Var(X) = 2. Table III (pp. 580 – 582) gives P(X< x) 1. Traffic accidents at a particular intersection follow Poisson distribution with an average rate of 1.4 per week. What is the probability that the next week is accident-free? b) What is the probability that there will be exactly 3 accidents next week? What is the probability that there will be at most 2 accidents next week?

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