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.
I only received one of the two books pictured on the item's page. That picture needs to be changed. I tried to look for a way to contact someone to get reimbursed but it wasn't easy like it is with a non-digital product.