Now typically, we talk about standard deviation more than variance, and it turns out standard deviation is just the square root of the variance. It's just that simple.
So, if I had this variance of 5.04, the standard deviation is 2.24. So you see now why we said that the variance = (σ)2. It's because σ itself represents the standard deviation. So, if I take the square root of (σ)2, I get sigma. That ends up in this example to be 2.24.
