4, 3.5, 5, 5.5, 4, 2
*Remember, the median is the middle number of a data set going from least to greatest :)
So, we must put this data set in order, from least to greatest.
2, 3.5, 4, 4, 5, 5.5
4 is your median :)
How do I know?
I know because 4 is in the middle of the data set when I put it in order.
~Hope I helped!~