commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/DoubleStatistics.java [614:648]:
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        throw new IllegalArgumentException(UNSUPPORTED_STATISTIC + statistic);
    }

    /**
     * Gets the geometric mean.
     *
     * @return a geometric mean supplier (or null if unsupported)
     */
    private StatisticResult getGeometricMean() {
        if (sumOfLogs != null) {
            // Return a function that has access to the count and sumOfLogs
            return () -> GeometricMean.computeGeometricMean(count, sumOfLogs);
        }
        return null;
    }

    /**
     * Gets the kurtosis.
     *
     * @return a kurtosis supplier (or null if unsupported)
     */
    private StatisticResult getKurtosis() {
        if (moment instanceof SumOfFourthDeviations) {
            return new Kurtosis((SumOfFourthDeviations) moment)
                .setBiased(config.isBiased())::getAsDouble;
        }
        return null;
    }

    /**
     * Gets the mean.
     *
     * @return a mean supplier (or null if unsupported)
     */
    private StatisticResult getMean() {
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/LongStatistics.java [622:656]:
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        throw new IllegalArgumentException(UNSUPPORTED_STATISTIC + statistic);
    }

    /**
     * Gets the geometric mean.
     *
     * @return a geometric mean supplier (or null if unsupported)
     */
    private StatisticResult getGeometricMean() {
        if (sumOfLogs != null) {
            // Return a function that has access to the count and sumOfLogs
            return () -> GeometricMean.computeGeometricMean(count, sumOfLogs);
        }
        return null;
    }

    /**
     * Gets the kurtosis.
     *
     * @return a kurtosis supplier (or null if unsupported)
     */
    private StatisticResult getKurtosis() {
        if (moment instanceof SumOfFourthDeviations) {
            return new Kurtosis((SumOfFourthDeviations) moment)
                .setBiased(config.isBiased())::getAsDouble;
        }
        return null;
    }

    /**
     * Gets the mean.
     *
     * @return a mean supplier (or null if unsupported)
     */
    private StatisticResult getMean() {
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