Answer:
The most common length of the pencil is 9cm as it is repeated most of the times.
Step-by-step explanation:
1) Number of pencils that are 9cm long = 5
2) Number of pencils that are 10cm long = 2
3) Number of pencils that are 11cm long = 1
4) Number of pencils that are 12cm long = 3
5) Number of pencils that are 13cm long = 2
6) Number of pencils that are 14cm long = 3