private static String p(final IntMomentStatistics statistics) {
		final NumberFormat nf = NumberFormat.getIntegerInstance();
		return format(
			"max=%s; mean=%6.6f; var=%6.6f",
			nf.format(statistics.max()),
			statistics.mean(),
			statistics.variance()
		);
	}
Return the minimal and maximal fitness.

@return minimal and maximal fitness
jenetics/src/main/java/io/jenetics/engine/EvolutionStatistics.java