commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/GammaDistribution.java [191:214]:
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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
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commons-statistics-distribution/src/main/java/org/apache/commons/statistics/distribution/TDistribution.java [205:215]:
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        @Override
        public double getMean() {
            return mean;
        }

        @Override
        public double getVariance() {
            return variance;
        }

        @Override
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