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.
After 3 or 4 failed tries to get them to stick on our glass shower wall without falling off, we are now about a month into some rock-solid hooks without a fail. I have no idea why it worked this time, but I'm not going to start wiggling them around or yanking on them to find out.