ENTRANCE HALL DOOR

Consider the following Stem and Leaf diagram:

Stem  |  Leaf
   1  |  1 2 3
   2  |  2 2 3 4 5
   3  |  1 2 3 3 4 4 4 5
   4  |  7 8 8 9
   5  |  1 4 5 7 8

What is the Median??