4.95 How many courses?

At a small liberal arts college, students can register for one to six courses. In a typical fall semester, 5% take one course, 5% take two courses, 13% take three courses, 26% take four courses, 36% take five courses, and 15% take six courses. Let be the number of courses taken in the fall by a randomly selected student from this college. Describe the probability distribution of this random variable.