To calculate the overall star rating and percentage breakdown by star, we do not 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.
These scales seem to be very accurate and the numbers don't jump around as a previous set that I bought did. They are also a nice size so that the readout doesn't get blocked from my view while using larger bowls. Overall, a great purchase.