![\huge{\boxed{3}}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/olbz8a16nio4cdg185wo71h865b0dfnf94.png)
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
![\boxed{3}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tfms09qz8f64igqnl49sk255txy8u6xpyn.png)