Let's get the calculator out to actually figure out our sample variance. Let me get the calculator out. And we have, so I'll do the numerator first. 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.