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.
Everything in this book are just unrelated statements. These are not steps. These are independent set of statements to address the situation mentioned. But it none of them is certain to give a desired outcome. One of the most useless book!