This, between minus 1 and 1, and I'll show you behind the scenes what Excel is doing. We're going from minus 1, which is roughly right here, to 1, and we're calculating the area under the curve. We're calculating this area. Or for those of you who know calculus, we're calculating the integral from minus 1 to 1 of this function, where the standard deviation is right here, is 10, and the mean is minus 5. Actually, let me put that in. So we're calculating, for this example, the way it's drawn right here, the normal distribution function, let's see, our standard deviation is 10 times the square root of 2 pi times e to the minus 1 half times x minus our mean. Our mean is negative right now.