So if you want 95% of the area in the middle, that means you have 5% not shaded in, and that's evenly divided on each side, so that means you have 2 1⁄2% at the tails, 2 1⁄2%. So what you wanna look for is a tail probability of 2 1⁄2%. So that is this right over here,.025, that's 2 1⁄2%. And so there you go, that is our critical value, 2.160. So this, so this part right over here, so this is going to be two, let me do that in a darker color. This is going to be 2.160 times, what's our sample standard deviation? It's 50 over the square root of n, square root of 14.