On the wiki:

   * [Gaussian distribution] (also known as the [Normal distribution])
   * [Poisson distribution]
   * [Gamma distributions]

Also, [tcllib] includes the normal, exponential, and uniform distributions.

Typical functionality in tcllib includes:
   * pdf-''distribution'': The probability density
   * cdf-''distribution'': The cumulative distribution function
   * random-''distribution'': Generate a pseudo-[random number] drawn from the distribution

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