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प्रश्न
The average number of customers, who appear in a counter of a certain bank per minute is two. Find the probability that during a given minute no customer appears
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उत्तर
The average number of customers
Who appear in a counter of a certain bank per minute = 2
∴ λ = 2
x follows poisson distribution with P(x) = `("e"^(-lambda)lambda^x)/(x!)`
P(no customber appears) = P(X = 0)
= `("e"^-2(2)^0)/(0!)`
= `"e"^-2`
= 0.1353
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