Quote - The ratings are done based on a 'standard deviation' system so that could be the cause of some of the confusion on how the calculations work. I'll explain how it works in detail when I get all the exact calculating details from the programmers.

Standard deviation system actually explains a lot. It's not a straight averafe.
A simplistic explanation of it is that it throws out single lowest or single highest rating if it's significantly diofferent from the average ratings.
It's actually sort of a protection from one or two people leaving a false bad comment.

The actual math is little different then what I explained above, but the concept is about the same.

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