And some people think, what's the probability that I land within one standard deviation of the mean? Well, that's easy to do. What I can do is I'll just click on this and I could call this, what's the probability that I land between, let's see, one standard deviation, the mean is minus 5, one standard deviation below the mean is minus 15. And one standard deviation above the mean is 10 plus minus 5 is 5. So that's between 5 and 15. So 68.3%, and that's actually always the case, that you have a 68.3% probability of landing within one standard deviation of the mean, assuming you have a normal distribution. So once again, that number comes from, that represents the area under the curve here.