The trimean is a way to figure out the average of a bunch of numbers. First, you put the numbers in order from smallest to biggest. Then, you do three things:
1. You find the middle number, which is called the median.
2. You find the number halfway between the smallest number and the median. This is like imagining a point halfway between the edge of a circle and the center.
3. You find the number halfway between the median and the biggest number. This is like imagining a point halfway between the center of a circle and the edge.
Once you have these three numbers, you add them up and divide by three. This gives you the trimean. It's like finding the average of three different points on a number line. It's a special way to figure out what a "typical" number is in a set of data.