Poisson Distribution CDF Calculator

For a Poisson distribution with rate parameter \(\lambda > 0\), the cumulative distribution function is: $$ F(x;\lambda)= \sum_{i=0}^{x}\frac{\lambda^i\,e^{-\lambda}}{i!},\quad x=0,1,2,\dots $$

* Enter a nonnegative integer \(x\) and a rate \(\lambda\).