if (this.arithmeticMean == null) { calculateApprovationRatioAndArithmeticMeanIfActive(true); } return this.arithmeticMean;
if (this.arithmeticMean == null) { calculateApprovationRatioAndArithmeticMeanIfActive(true);
	public Double getArithmeticMean() {		if (this.arithmeticMean == null) {			calculateApprovationRatioAndArithmeticMeanIfActive(true);		}		return this.arithmeticMean;	}