All right, so what's the probability that I have 2 left steps, and if I have 2 left steps, I took a total of 10 steps, so I'm going to have 8 right steps, and that puts me 6 to the right. So that's this point right here. So what's that probability? How do I figure this out using the probability density function? How do I figure this out? Well, I say the probability of taking 2 left steps, that's how I calculated it. If you actually click on the cell, you'll see that, is equal to 1 over the standard deviation, 1.581.