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/e3[1+3+9/2]
=17/2e3
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