To calculate the overall star rating and percentage breakdown by star, we do not 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.
My wife bought this book for me because I have some sort of A.D.D, D.V.D. or what ever they call it. To be honest, it's a very tough read and I found myself day dreaming while I trying to read it. I love her for thinking of me but after 10 pages it went straight to the used book store because it was hard to focus on and tough to decipher. It needs to have a much simpler approach and be easier to understand. She no longer buys me these kinds of books... lol.