So what I did is I evaluated the cumulative distribution function at 1, which would be right there. And I evaluate the cumulative distribution function at minus 1, which is right there. And the difference between these two, I subtract this number from this number and that tells me essentially the probability that I'm between those two numbers, or another way to think about it, the area right here. And I really encourage you to play with this and explore the Excel formulas and everything. This area right here, between minus 1 and 1. Now one thing that shows up a lot is what's the probability that you land within the standard deviation of, and just so you know this graph, the central line right here, this is the mean, and then these two lines I drew right here, these are one standard deviation below and one standard deviation above the mean. And some people think, what's the probability that I land within one standard deviation of the mean?