So if we go one standard deviation to the right, that is going to be 1. If you go two standard deviations, it's going to be 2, three standard deviations, 3, just like that. One standard deviation to the left is going to be minus 1. Two standard deviations to the left will be minus 2, and so on and so forth. Minus 3 will be three standard deviations to the left, because the standard deviation is 1. So let's see if we can answer this question. So what's the percentage of data below 1?