Y is the mass of a random animal selected at the New Orleans Zoo. Is this a discrete random variable or a continuous random variable? Well the exact mass, and I should probably put that qualifier here. I'll even add it here just to make it really clear. The exact mass of a random animal or a random object in our universe, it can take on any of a whole set of values. I mean who knows exactly the exact number of electrons that are a part of that object right at that moment. Who knows the neutrons, the protons, the exact number of molecules in that object or part of that animal exactly that moment.