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 analyzes reviews to verify trustworthiness.
I love this series of books! I use them with my second graders when we do our non-fiction reports. This particular book (series) is great for lower readers / struggling readers. Lots of great pictures, non-fiction text features, and big print makes it easy for even struggling readers to gather important facts and be successful while their peers are working with higher level texts.