To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Son loved this book! Only con was 6-year-old son also hated sitting in his room for the afternoon for buying it on my kindle without permission! Somehow he figured out how to turn off parental controls...my child is smarter than me :/