docs: @Override
  	public RandomVariable addRatio(RandomVariable numerator, RandomVariable denominator) {
  		return apply(new DoubleBinaryOperator() {
  			@Override
  			public double applyAsDouble(double x, double y) {
  				return x + y;
  			}
  		}, new DoubleBinaryOperator() {
  			@Override
  			public double applyAsDouble(double x, double y) {
  				return x / y;
  			}
  		}, numerator, denominator);
  	}