A flaw in InversePoisson( <Gemiddelde>, <Probabiliteit> )
There seems to be a flaw in the function InversePoisson( <Gemiddelde>, <Probabiliteit> )
It it supposed to give the first value n for which P(X≤n) ≥ p, but it does not do so. Instead it returns the second value with this property. Since it is consequently doing this it is not a big problem, but I think it would be better if repaired.
There's always the option I am wrong, but I think it is worth looking into.