Variance, we just took each data point, how far away from the mean, squared that, took the average of those. Then we took the square root, really just to make the units look nice, but the end result is we said that that first data set has 10 times the standard deviation. As the second data set. So let's look at the two data sets. This has 10 times the standard deviation. Which makes sense intuitively. I mean, they both have a 10 in here, but each of these guys, 9 is only 1 away from the 10, 0 is 1 away from the 10.