I have done a bit of math on this. If you have around 80 people rating on avg 4.96 and then someone comes and rates 3.5 the score will lower 0.02 if the users weight is around avg (50).
0.02 rating change can seem like quite abit but we should remember that most sites only show a rating of 5 or 4.9. We have two decimals so every little change will be noticable.
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