At the end of the city's annual marathon, each participant completed a questionnaire. the marathon's planner randomly chose 30 of the surveys to review. which statement best describes the random sample? a) the 30 surveys are likely to be representative of all the runners in the marathon. b) the 30 surveys are likely to be representative of all who came to watch the marathon. c) the 30 surveys are not likely to be representative of all the runners in the marathon. d) the 30 surveys are likely to be representative of only the runners placed in the marathon.