commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/FDistribution.java [282:326]:
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    @Override
    public double getMean() {
        return mean;
    }

    /**
     * {@inheritDoc}
     *
     * <p>For numerator degrees of freedom parameter \( n \) and denominator
     * degrees of freedom parameter \( m \), the variance is:
     *
     * <p>\[ \operatorname{var}[X] = \begin{cases}
     *       \frac{2m^2 (n+m-2)}{n (m-2)^2 (m-4)} &amp; \text{for } m \gt 4 \\
     *       \text{undefined}                     &amp; \text{otherwise}
     *       \end{cases} \]
     *
     * @return the variance, or {@link Double#NaN NaN} if it is not defined.
     */
    @Override
    public double getVariance() {
        return variance;
    }

    /**
     * {@inheritDoc}
     *
     * <p>The lower bound of the support is always 0.
     *
     * @return 0.
     */
    @Override
    public double getSupportLowerBound() {
        return SUPPORT_LO;
    }

    /**
     * {@inheritDoc}
     *
     * <p>The upper bound of the support is always positive infinity.
     *
     * @return {@linkplain Double#POSITIVE_INFINITY positive infinity}.
     */
    @Override
    public double getSupportUpperBound() {
        return SUPPORT_HI;
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commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/NakagamiDistribution.java [165:203]:
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    @Override
    public double getMean() {
        return mean;
    }

    /**
     * {@inheritDoc}
     *
     * <p>For shape parameter \( \mu \) and scale parameter \( \Omega \), the variance is:
     *
     * <p>\[ \Omega\left(1-\frac{1}{m}\left(\frac{\Gamma(m+\frac{1}{2})}{\Gamma(m)}\right)^2\right) \]
     */
    @Override
    public double getVariance() {
        return variance;
    }

    /**
     * {@inheritDoc}
     *
     * <p>The lower bound of the support is always 0.
     *
     * @return 0.
     */
    @Override
    public double getSupportLowerBound() {
        return SUPPORT_LO;
    }

    /**
     * {@inheritDoc}
     *
     * <p>The upper bound of the support is always positive infinity.
     *
     * @return {@linkplain Double#POSITIVE_INFINITY positive infinity}.
     */
    @Override
    public double getSupportUpperBound() {
        return SUPPORT_HI;
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