Cars coming along Magnolia Street come to a fork in the road and ahve to choose either Willow Street or Main Street to continue.
Assume that the number of cars that arrive at the fork in unit time has a Poisson distribtuion with parameter λ=4. A car arriving at the fork chooses Main Street with probability 3/4 and willow Street with probability 1/4. Let X be the random variable which counts the number of cars that, in a given unit of time, pass by Joe's Barber Shop on Main Street. What is the distribution of X?
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