A histogram showing different age groups (0-10, 11-20, 21-30, 31-40, 41-50, 51-60, 61-70, 71-80, and 81-90, for example) along the x-axis and the number of theater-goers along the y-axis would successfully compare the actual number of people in each of these numerical groups. A circle graph in which each slice represents one of these age groups will compare their relative sizes.