Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
Delivery was quick! I ordered this as a cute little gag-gift for my husband for Father's Day, looks like it will be a success. However, kind of disappointed that the cover of the book was slightly torn in one spot. (Image Included)