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.
I purchased one of the books in this series and loved them so much, I ended up getting the entire series. The are easy to read, brightly coloured and so educational. I’m sure they will be favourites for many years.