Here, we wanna construct a legitimate probability model. Well, how would we do that? Well, the estimated probability of getting a chicken is going to be the fraction that you're sampling from that is, are chickens, because any one of the animals are equally likely to be selected. 97 of the 97 plus 47 plus 77 animals are chickens. And so, what is this going to be? It's going to be 97 over 97, 47, and 77. You add them up.