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Answer & ExplanationAnswer: Option [C]

p is the number of cars per minute passing through a certain road junction.

The random variable P follows Poisson distribution with mean 3.

So, Prob(P = r)=

We have to determine probability of observing fewer than 3 cars.

So, r=0,1,2

Prob(P=0) + Prob(P=1) + Prob(P=2)

+ +

=1/e^{3}[1+3+9/2]

=17/2e^{3}

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