Ski IQ Metric Average Calc?

Looking at the metrics breakdown for each segment run, it appears that the overall value of the 8 turns is not an average or a median score. It appears that your overall run % value for each metric is solely based on your 5th worst value out of the 8 turns? How is that an average? Or median? Each metric description states based on average? 5th worst score is not an average and is not a good statistical method. Let's say you score 100, 100, 100, 90, 80, 78, 76, 75. Should 80 be your average for that metric? That is what is shown based on the current programming. Actual average is 87, and median is 85. Please explain? Not sure why explanations state averages when that is not even close to what is being shown? Looking forward to explanations. Thanks Dan