Now, we also know that for a normal distribution, the area below the mean is going to be 50%. So we know all of that is 50%. And so the combined area below 170, below one standard deviation above the mean, is going to be 84%, or approximately 84%. And so that helps us figure out what is the area above one standard deviation above the mean, which will answer our question. The entire area under this density curve, under any density curve, is going to be equal to one. And so if the entire area is one, this green area is 84%, or 0.84, well, then we just subtract that from one to get this blue area. So this is going to be one minus 0.84, or I'll say approximately.