function variance = gumbel_variance ( )

%*****************************************************************************80
%
%% GUMBEL_VARIANCE returns the variance of the Gumbel PDF.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    12 September 2004
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, real VARIANCE, the variance of the PDF.
%
  variance = pi * pi / 6.0;

  return
end