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.
After reading Laura Frantz's The Frontier's Daughter, I had to read An Uncommon Woman. It came up to all my expectations of being taken to another time and place with so many hardships, yet triumphs. A good book to read in today's challenges. I loved it.