An observer counts 360 veh/h at a specific highway location. Assuming that the arrival of vehicles at this highway location is Poisson distributed, estimate the probability of having 0, 1, 2, 3, 4, and 5 or more vehicles arriving over a 20 - second time interval

The average arrival rate, , is 360 veh/h, or 0.1 vehicles per second (veh/s). Using this in Eq. 5.23 with t = 20 seconds, the probabilities of having exactly 0, 1, 2, 3, and 4 vehicles arrive are

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