# The Poisson Distribution

The **Poisson Distribution** is a discrete distribution which takes on the
values X = 0, 1, 2, 3, ... . It is often used as a model for the
number of events (such as the number of telephone calls at a business or the
number of accidents at an intersection) in a specific time period.
It is also useful in ecological studies, e.g., to model the number of prairie dogs
found in a square mile of prairie.
The Poisson distribution is determined by one parameter, lambda.
The distribution function for the Poisson distribution is

f(x) = exp(-1*lambda) lambda^x / x!
In our applet, R. A. is fishing at Mentone Beach and observing the number
of sharks seen in area one square mile in different one hour time periods.
Use the "Fish" button to run the applet. To change the parameter lambda,
type in the value and hit the "Clear" button.

## Source Code

This applet uses the Danby package

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This applet was written by Charles Stanton