PDF chapter test TRY NOW

The 30 school student's age (in years) are given below, then find the mode of their ages.
 
1217, 129, 17, 14, 17, 14, 9, 14, 12, 14, 9, 12, 14, 17, 14, 9, 17, 12, 14, 9, 17, 9, 12, 12, 17, 9, 14, 17.
 
The mode of 30 school student's ages = ii
[Note: Insert the answer in ascending order].
1