/// <summary>
/// Returns the cumulative distribution function. </summary>
/// <param name="x"> x </param>
/// <returns> result </returns>
public virtual double cdf(double x)
{
return(Probability.normal(mean, variance, x));
}
/// <summary>
/// Returns the cumulative distribution function. </summary>
/// <param name="x"> x </param>
/// <returns> result </returns>
public virtual double cdf(double x)
{
return(Probability.chiSquare(freedom, x));
}