Paul is ordering a cheeseburger at a restaurant. He can choose the size of the burger and the type of cheese. He can choose a -pound burger, a -pound burger, or a -pound burger. For cheese, he can choose cheddar, Swiss, pepperjack, or American. The following tree diagram shows the types of burgers he can choose. If he chooses randomly, plot the probability that he chooses a -pound or -pound burger with Swiss cheese.