A measure of central tendency, it is three. So I'll just put three right over here, I'll just mark it with that dotted line. That's where the mean is. All right, well we've visualized that a little bit, and that does look like it's the center. It's a pretty, it makes sense. So now let's look at this other data set right over here. So the mean, the mean over here is going to be equal to one plus one plus six plus four, all of that over, we still have four data points.