CommandsStatsPoissonCDFOn this pageStatsPoissonCDF StatsPoissonCDF (x, λ) The StatsPoissonCDF function returns the Poisson cumulative distribution function. F(x;λ)=∑i=0xexp(−λ)λii!,x=0,1,2…\displaystyle F(x ; \lambda)=\sum_{i=0}^{x} \frac{\exp (-\lambda) \lambda^{i}}{i!}, \quad x=0,1,2 \ldotsF(x;λ)=i=0∑xi!exp(−λ)λi,x=0,1,2… See Also Statistical Analysis, StatsPoissonPDF, StatsInvPoissonCDF