I have 57 times 0 minus 0.43 squared plus 43 times 1 minus 0.43 squared. And then all of that divided by 100 minus 1, or 99, is equal to 0.2475. So this is equal to, so my sample variance is equal to 0.2475. And if I want to figure out my sample standard deviation, I just take the square root of that. My sample standard deviation is just going to be the square root of my sample variance. So I take the square root of that value that I just had, which is 0.497. So actually, let me just round that up as 0.50.