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.
Got this book for my 6 year old son to read. His teacher told me his reading level and I got him books based off that level. My son loves these books. I like how thin they are because it fits on his book shelf perfectly.