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.
Let me tell you, I’m a guy who sweats a whole lot. My boss bought us all jumpers at work with the company logo on them and we have to wear them all the time so we’re advertising for him wherever we go. This is hard in summer though because he still makes us wear the jumpers and i get very hot and sweaty. He won’t buy us shirts with the logos on them so I’ve had to buy lots of this deodorant to keep from getting so sweaty.