static boolean eq(final double a, final double b) {
		return abs(ulpDistance(a, b)) < MAX_ULP_DISTANCE;
	}
Check if the given probabilities sum to one.

@param probabilities the probabilities to check.
@return {@code true} if the sum of the probabilities is within the error
        range, {@code false} otherwise.
jenetics/src/main/java/io/jenetics/ProbabilitySelector.java