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 had bought a new coffee maker and thought I would treat myself.....soooooo good! I tried to go back to my regular but.....I have just put in my fifth order and am making a gift of one. Oh and it arrived without issue and on time. Recommend.