In a group of 20 students, the number of times that each student needs to repeat the table in order to learn to multiply with the 6 table is observed. The results were: 5, 8, 3, 9, 6, 7, 10, 6, 7, 4, 6, 9, 5, 6, 7, 9, 4, 6, 8, 6 Explain which measurement you would use and why?