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.
Great book. Bought used for only 5 dollars. There was some damage to it - looked like water damage but smelt like perfume. There was also gross crusty white stuff on the cover which I cleaned without issue. Would give lower starts but it was used for 5$ and is a helpful book.