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.
Not too difficult to find images, but still challenging. My four year old had a good time. The highlighter is light enough not to be distracting. Good number of pages and variety of pictures. Fit well in an Easter basket.