That's where that number comes from. If I go to, let's say, this one right here, this one right here is calculated. Actually, let me write it out, because I think it's interesting. I have a total of 60 total moves, so it's 60 factorial over, I have to have 25 left moves, so 25 factorial, 60 minus 25 factorial, times the probability of a left move, and I have 25 of them, times the probability of a right move, and I have 35 of those. So that's just what the binomial probability distribution will tell us. And then it figures out the mean and the variance for each of those circumstances, and you could look at the formula, but the mean is just the probability of having a left move times the total number of moves. The variance is probability of left times probability of right times total number of moves.