bethanypearce0 bethanypearce0 23-05-2016 Mathematics contestada The ages of people signed up for piano lessons are listed. 11, 16, 15, 9, 19, 12, 13, 13, 11, 11, 18, 17 What is the mode of the ages? A. 12 B. 15 C. 13 D. 11