So let's just think about this a little bit. 1 minus 2 squared, then you have 2.5 minus 2 squared. 2.5 minus 2, 2 being the sample mean, squared plus, let me see this green color, plus 2 minus 2 squared, plus 1 minus 2 squared. And then maybe you would divide by the number of data points that you have, where you have the number of data points. So in this case, we're dividing by 6. And what would we get in this circumstance? Well, if we just do the computation, 1.5 minus 2 is negative 0.5.