So our sample mean here is 2.34. And then you can also calculate your sample standard deviation. Find the square distance from each of these points to your sample mean, add them up, divide by n minus 1 because it's a sample, then take the square root, and you get your sample standard deviation. And I did this ahead of time just to save time. Sample standard deviation is 1.04. And we don't know anything about the population distribution. The thing that we've been doing from the get go is estimating that character with our sample standard deviation.