The Exponential Distribution

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The waiting time to observe the occurrence of an event in a Poisson process with intensity is a random variable that follows the exponential distribution with parameter
(which must be positive). The exponential distribution is a special case of the gamma distribution with parameters
and
. The red vertical segment marks the mean of the distribution.
Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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"The Exponential Distribution"
http://demonstrations.wolfram.com/TheExponentialDistribution/
Wolfram Demonstrations Project
Published: March 7 2011