Whereas z* value for the top 5% was -1.65, the one for the bottom 5% was +1.65 (Moore, McCabe, & Craig, 2009). The formula yielded the values x = -3.90 and x = 48.23. Since the minimum value was negative, it was accepted as limit value. Maximum value in monetary was 71.7 and thus higher than 48.23. Therefore, maximum value was taken as 71.7. In order to generate a fuzzy logic membership function, it was necessary to identify the limits for the categories “poor”, “average” and “good”. For that reason, the lower limit was subtracted from the upper limit and it was divided by 4 in order to obtain interval values: x = (71.7-0) / 4 = 17.92