Given that x has a poisson distribution with u=1.8, what is the probability that x=4?

P(x=4 | mean =1.8) = e^{-1.8} (1.8)^{4}/4! = 0.072302

alternatively

=poisson(4,1.8,false) or

=poisson(4,1.8,0)

= 0.072302

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