So this is the variance, this is our best estimate, of the variance of the population. And we want to divide that by the sample size. And then plus our best estimate of the variance of the population of group 2, which is 4.04 squared, the sample standard deviation of group 2 squared, that gives us the variance, divided by 100. And this gives us, I did it before in the last, maybe it's still sitting on my calculator. So, yep, it's still sitting on the calculator. It's this quantity right up here, 4.67 squared divided by 100, plus 4.04 squared divided by 100, so it's 0.617. So this right here is going to be, this right here is 0.617.