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Question

In a big city, 5 accidents take place over a period of 100 days. If the numebr of accidents follows P.D., the probability that there will be 2 accidents in a day is

A
e5522!
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B
e05522!
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C
e005(0.05)22!
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D
e5522!
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Solution

The correct option is B e005(0.05)22!
By using Poisson distribution,
P(x;μ)=eμμxx!
μ : The mean number of successes that occur in a specified region.
x : The actual number of successes that occur in a specified region.
P(x;μ) : The Poisson probability that exactly x successes occur in a Poisson experiment, when the mean number of successes is
μ=5100=0.05
x=2
P(2;005)=e0.050.0522!

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