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Q.

A firm hires out 3 cars every day. The demand for a car on each day is distributed as a Poisson distribution with mean 2.0. The probability that some demand is refused on a day is (e−2 = 0.135)

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a

0.2177

b

0.1912

c

0.1455

d

0.0192

answer is C.

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Detailed Solution

λ = 2 P(X>3)=1−[P(X=0)+P(X=1)+P(X=2)+P(X=3)]                   = 1−[1+2+222!+233!]e−2                  =0.1455
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