In which of the following situations is the probability calculated empirically? A classroom has 30 students, 15 of which are male, so the probability that a random student in the classroom is male is 50%. A historian believes that there is a 2% chance Elvis Presley was murdered. A researcher conducts a survey of college students and finds that 200 out of 500 respondents identify themselves as Democratic, so the estimated probability that a college student is Democratic is 40%. Out of 1000 fans at a rock concert, 600 are male, so if a random person gets called to the stage, the probability that that person will be male is 60%. A sociologist takes a sample of 1000 families in the United States and finds that 50 are below the poverty line, so the estimated probability of a family being below the poverty line in the United States is 5%