So once again, the difference between each outcome and the mean, we square it and we multiply times the probability of that outcome. So this is going to be negative 2.1 squared, which is just 2.1 squared, so I'll just write this as 2.1 squared times 0.1. That's the first term. And then we're going to have plus, one minus 2.1 is negative 1.1, and then we're going to square that. So that's just going to be the same thing as 1.1 squared, which is 1.21, but I'll just write it out. 1.1 squared times 0.15, and then this is going to be two minus 2.1 is negative 0.1 when you square it is going to be equal to, so plus 0.01. If you have negative 0.1 times negative 0.1, that's 0.01 times 0.4 times 0.4, and then plus, this is going to be 0.9 squared, so that is 0.81 times 0.25, and then we're almost there.