The box plot shows the number of years during which 24 colleges have participated in a local college fair: A boxplot is titled Years of Participation and labeled Years. Number line from 0 to 10 with primary markings and labels at 0, 5, and 10. The box extends from 2 to 7 on the number line. There is a vertical line at 4. The whiskers end at 0 and 9. At least how many schools have participated for 2 years or fewer? 2 schools 4 schools 6 schools 7 schools