The list below shows the ages of the first 20 customers at a new computer game store. 6, 7, 9, 10, 14, 15, 16, 17, 20, 26, 26, 29, 31, 34, 35, 38, 40, 51, 59, 67 a) Decide what class intervals to use, and then create a frequency table for the ages. (4 points: 2 points for intervals, 2 points for frequencies)