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.
My professor was great, but she didn't give us any guidance on how she wanted us to analyze and write answers. This saved me! The rules are great, the examples are on point. I got a 4.0 in the class, largely due to my cramming session with this book. Buy it if your professor is all over the place and hides the ball.