What is the median of the set of values?

5 9 1 2 7 3 1 8 8 1 3

To find the median of a set of values, we first need to arrange the values in ascending order:

1 1 1 2 3 3 5 7 8 8 9

Since there are 11 values, the median would be the middle value. In this case, it is the 6th value which is 3.

Therefore, the median of this set of values is 3.