Answer:
The median is 4.
Explanation
if you layout all the number, you get
1,2,2,3,3,3,4,5,5,5,6,6,7
So, to find the median you find the number(s) right in the middle.
(Ex. 3,4,5; 4 is the median)
(Ex. 3,4,5,7; 4.5 is the answer)
The middle number of
1,2,2,3,3,3,4,5,5,5,6,6,7
is 4, so 4 is the median.
hope this helps. :)