Five students measured the lengths of their pencils using a scale and the results were as follows:
15.5 cm, 12 cm, 11.8 cm, 9.7 cm, 7 cm
What is the average length of all pencils?
1
10.6 cm
2
11.4 cm
3
10.9 cm
4
More than one of the above
5
None of the above