And we'll talk about the degrees of freedom in a second. Actually, let me write it with a curly X, just so you see that some people write it with the chi instead of the X. So our chi-squared statistic over here, we're literally just going to find the squared distance between the observed and expected, and then divide it by the expected. So this is going to be 20 minus 25.3 squared over 25.3 plus 30 minus 29.4 squared over 29.4. I'm going to run out of space. Plus 30 minus 25.3 squared over 25.3. And then I'm going to have to do these over here.