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.
Very useful, informing, and educational. Giving only four stars because I wish it was more clear up front that this is based on British English rather than American English. However, you can still differentiate and easily apply to American English setting.