Exponential Distribution

(continuous probability dist for equations)

Usage:

ExponentialDist (x, λ)

Definition:

λ exp (- λ x)

Required:

λ > 0

Support:

x0

Moments:

μ = 1 / λ        σ = 1 / λ

γ1 = 2        β2 = 9

If events occur by a Poisson process, then the time between successive events is described by the exponential distribution (where l is the average number of events per unit time).