Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I ordered mineral water but I received drinking water. I almost finished two boxes and found out that this was not what I want to item. another one came to me. I felt very bad about it, I think that it was cheating consumers.