And let me make it very clear. This right over here, this 4 is the mean. This 4 is the mean. So you're taking each of the data points, and you're seeing how far it is away from the mean. You're taking the absolute value, because you just want to figure out the absolute distance. Now you see, or maybe you see, 4 minus 4, this is, let me do this in a different color, 4 minus 4, that is the 0. That is that 0 right over there.