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If the number of telephone calls an operator receives between 5.00 pm to 5.20 pm follow poisson distribution with mean 2. The probability that the operator receives zero call during that interval the next day is

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a

e33

b

e−2

c

e–33

d

3e–3

answer is B.

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Detailed Solution

λ=2, P(X=0)=e−2

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