And the interquartile range is all about figuring out the difference between the middle of the first half and the middle of the second half. It's a measure of spread, how far apart all of these data points are. And so let's figure out the middle of the first half. So we're going to ignore the median here and just look at these first four numbers. And so out of these first four numbers, I have, since I have an even number of numbers, I'm going to calculate the median using the middle two numbers. So I'm going to look at the middle two numbers here, and I'm going to take their average. So the average of four and six, halfway between four and six is five.