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 have three 8-year olds who sit mesmerized when listening to it even though, at this point, they've heard it multiple times. Not a peep out of them till it's over. It's a big help when I'm trying to get dinner on the table.