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.
Bought this book awhile ago, maybe a year or so, finally got to reading it and noticed it was missing an entire section. Date 3. I looked at the reviews and noticed this has happened with someone else also.