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.
Got the book and it was obvious that it was not lightly used. Didn't have enough time to return it and get another one because of the time constraint with my classes and the need to have the book for research. Ripped at the top cover, stained with some type of substance all at the top. Was thinking of purchasing this book after my course, but when it turned up in that type of condition I changed my mind.