The sample space of an experiment is S={1,2,3,4,5}. If each outcome is equally likely to occur, which graph models the expected probability of each outcome?

A bar graph would be best suited to model the expected probability of each outcome in this case. Each outcome would be represented by a separate bar on the graph, with the height of each bar indicating the probability of that outcome occurring. Since each outcome is equally likely to occur, the height of each bar would be the same for each outcome.