Median Books Read by Students

In a class of 20 students, the teacher recorded the number of books read by each student during the summer. Here is the data collected:

3, 5, 4, 2, 6, 5, 7, 3, 8, 5, 6, 7, 4, 5, 3, 2, 6, 2, 7, 8

What is the median number of books read by the students?