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27-11-2017
Mathematics

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Suppose that commercial airplane crashes in a certain country occur at the rate of 2.5 per year. what is the probability that four or more crashes will occur next year?

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27-11-2017

The poisson distribution applies here.
[tex]\lambda=2.5[/tex]
[tex]P(X=4)=\frac{e^{-2.5}\times2.5^{4}}{4!}=0.134[/tex]

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