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. And then the normal probability, once again, I just use the normal probability, I just use the, so I approximate it the same way. So for example, in this situation right here, and Excel has a normal distribution function, but I actually typed in the formula because I wanted to kind of see what was under the covers for that function that Excel actually has. So I actually say, what's the probability of 45 left moves?