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.
My 5 and 7 year old love to read these books. They have a hard time not peeking ahead at the next chapters. We have read #1-6 and only one more book left in the series. I have already pre-ordered the 8th book but it won't be out for 5 months (June 2020). I hope the author continues to write more adventures for these adorable characters.