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Calculate a poisson distribution from 2 floats. This is useful for determining probability of events that happen over a fixed period of time if the events have a known average rate and are independent of time since last event.

poisson : Float -> Float -> Float

Poisson function poisson 1 1

```
module Poisson exposing ( poisson )
{-| Calculate a poisson distribution from 2 floats. This is useful for
determining probability of events that happen over a fixed period of time
if the events have a known average rate and are independent of time since last
event.
# Definition
@docs poisson
-}
{-| Poisson function
poisson 1 1
-}
poisson : Float -> Float -> Float
poisson pVar lambda =
(pVar / e) + (lambda / e)
```