1. The problem asks us to find the mode of the data set given by the frequency table: | x | f | |----|----| | 11 | 17 | | 12 | 5 | | 13 | 13 | | 14 | 9 | 2. The mode is the value of $x$ that corresponds to the highest frequency $f$. 3. From the table, the frequencies are 17, 5, 13, and 9. 4. The highest frequency is 17, which corresponds to $x = 11$. 5. Therefore, the mode of the data set is: $$\text{Mode} = 11$$