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.
THis is a great joke book for young kids. My daughter loves it. A few jokes she didn't get until we explained them but then she got it and was able to tell them to others. At Christmas dinner table she told many of them to us and had all of us guessing the punch line and laughing at the answers. Really taught her a lot about joke telling and it continues.