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 thought I was ordering the book to be mailed to me not entered into my Kindle. Unfortunately, on the Kindle the right hand side of each page is cut off so there are notes missing so the tunes are not playable.