[tex]\huge{\boxed{3}}[/tex]
The median is the middle number when the numbers are arranged least to greatest, which they already are.
Take numbers away two at a time, one from the front and one from the back.
1,2,3,3,3,8,8,11,15
2,3,3,3,8,8,11
3,3,3,8,8
3,3,8
This means that the median is [tex]\boxed{3}[/tex]
