So this is 4.67, and this number right here is 4.04. The s is 4.67, we're going to have to square it, and the s2 is 4.04, we're going to have to square it. So let's calculate that. So we get, we're going to take the square root of 4.67 squared, divided by 100, plus 4.04 squared, divided by 100, and then close the parentheses, and we get.617. So this is equal to, let me write it right here, this is going to be equal to 0.617. So if we go back up over here, we calculated the standard deviation of this distribution to be 0.617. So now we can actually calculate our interval, because this is going to be 0.617.