Given that the set of data 2, 3, 7, 10, 11, 11, 12
We need to determine the mode of the set of data.
Mode:
The mode of the set of data is the number that occurs the highest number of times.
Hence, from the set of data 2, 3, 7, 10, 11, 11, 12, we need to determine the number that occurs the highest number of times.
The number that occurs the highest number of times in the given set is 11.
It occurs 2 times in the set which is the highest number of times.
Thus, Mode = 11
Therefore, the mode of the set is 11.
Hence, Option C is the correct answer.