A social psychologist wants to know the physical distance at which people are comfortable when in face-to-face conversation. She engages 20 participants in conversation on a neutral topic. Later, using a stationary video of the conversation taken against a 1 in. × 1 in. background pattern, she measures the number of inches each person stood from her when speaking. What measure of central tendency best summarizes the speaking distance of the 20 participants? Why?