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.
Just tested this skill and it gave me a UV level of 5.7. Checked this against the ARPANSA website and their level was also 5.7. More accurate than a previous skill I was using.