The median of your data would be 9.
First, align the numbers from least to greatest:
1, 5, 6, 9, 12, 16, 84
Next, identify which number is in the middle; if you have a hard time figuring that out you may want to strikethrough numbers on both sides until you have only one number left—that would be your median per se (i.e., 9 is the median of this data set).