To find the Median, place the numbers you are given in value order and find the middle number. In this case there are two middle numbers. So you will add the two middle numbers and divide by 2 to calculate the median.
1,1,1,1,2,2 ,2,3 ,3,3,3,3,3,4
2+3/2 = 2.5 The median is 2.5