This value on top, we just figured out, is the square root of 0.21. So this is the square root of 0.21 over the square root of 150, and I can get the calculator out to calculate this, so I'll just do it the way I wrote it. Square root of 0.21, and I'm going to divide that, so whatever answer is, I'm going to divide that by the square root of 150. So it's 0.037. So we figured out the standard deviation here of the distribution of our sample proportions is going to be, let me write this down, I'll scroll over to the right a little bit. It is 0.037. I think I'm falling off the screen a little bit.