Your question is incomplete..
If these were the statements:
The mean of this data set is 17.
The median is 12.5.
The median is 14.5.
The mean is more affected by the outlier.
The median is more affected by the outlier.
The mean of this data set is 12.
Answer:
The mean of this data set is 17.
The median is 12.5.
The mean is more affected by the outlier.
Explanation: