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X ~ Po(λ) = "Variable X follows a Poisson distribution with lambda equals to 4."

Po is used to characterize the frequency with which an event occurs within a specific interval. λ is the number of repetitions.

Example: If we know a fly lands 3 times in 10 seconds, we can use Po to determine the likelihood that it lands 8 times in 20 seconds.

Observation: Po stars from 0 because no event can happen a negative number of times. mu and sigma squared are both equal to λ

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