commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/BetaDistribution.java [193:219]:
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    @Override
    public double getMean() {
        return mean;
    }

    /**
     * {@inheritDoc}
     *
     * <p>For first shape parameter \( \alpha \) and second shape parameter
     * \( \beta \), the variance is:
     *
     * <p>\[ \frac{\alpha \beta}{(\alpha + \beta)^2 (\alpha + \beta + 1)} \].
     */
    @Override
    public double getVariance() {
        return variance;
    }

    /**
     * {@inheritDoc}
     *
     * <p>The lower bound of the support is always 0.
     *
     * @return 0.
     */
    @Override
    public double getSupportLowerBound() {
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commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/GammaDistribution.java [191:215]:
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    @Override
    public double getMean() {
        return mean;
    }

    /**
     * {@inheritDoc}
     *
     * <p>For shape parameter \( k \) and scale parameter \( \theta \), the
     * variance is \( k \theta^2 \).
     */
    @Override
    public double getVariance() {
        return variance;
    }

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