q2 here is a chi-squared distributed random variable with two degrees of freedom. And just to visualize the set of chi-squared distributions, let's look at this over here. So I got this off of Wikipedia. This shows us some of the probability density functions for some of the chi-squared distributions. This first one over here, for k equal to 1, that's the degrees of freedom. So this is essentially our q1. This is our probability density function for q1.