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.
Amazon never failed to amaze me, they did fantastic job in everything and even in packaging. Bought 3 packs of tissue and delivered in a huge carton box. It was wonderful and perfectly fine but I wonder if they spent too much 'resources' for boxes. I don't mind if Amazon just send me without carton box, it would be more economical and environment friendly. It would be a win-win solution if Amazon has option in order page whether customer prefer to deliver with box or no box.