Construct a grouped frequency distribution table for the ages of 30 teachers in a secondary school as recorded below : 26, 29, 25, 40, 30, 32, 28, 35, 29, 29, 40, 41, 27, 45, 28, 29, 25, 53, 52, 55, 27, 51, 37, 38, 35, 52, 27, 42, 47, 54.