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.
This book is horrible... unless I'm missing something. You will be much better off with "The Art of Cello Playing" by Louis Potter Jr. The other book to use for a companion to Potter's is "170 Foundation Stuties for Violoncello" by Alvin Schroeder.