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Cars cross a certain point on the highway in accordance with a Poisson process with rate...

Cars cross a certain point on the highway in accordance with a Poisson process with rate = 3 per minute. If Al runs across the highway at some random time, what is the probability that he will avoid being hit by a car if the amount of time that it takes him to cross the road is s seconds? (Assume that if a car goes by while Al is on the highway, that it will hit him.)

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