There you go. So let me calculate the variance of this data set. So we already know its mean. So its variance of this data set is going to be equal to 8 minus 10 squared plus 9 minus 10 squared plus 10 minus 10 squared plus 11 minus 10 squared plus 12 minus 10 squared. Remember that 10 is just the mean that we calculated. You have to calculate the mean first. Divided by, we have 1, 2, 3, 4, 5 squared differences.