Poisson distribution Probabilities

Calculates probabilities under Poisson distribution.

Poisson distribution formulas

X is a random variable that counts the number of events that occur during a fixed time or space interval. We suppose that X follows a poisson distribution of parameter `lambda`.
P(X = k) is the probability of having exactly k event occurences.

`P(X = k) = (lambda^k * e^(-k))/(k!)`
where `k!` is the factorial of k,
`k! = 1*2*3...*(k-1)*k`

See also

Inverse Poisson distribution
Measures on poisson distribution
Poisson distribution Chart
Statistics Calculators