The National Survey of Student Engagement (NSSE) surveys freshmen and seniors about their level of engagement in campus and classroom activities that enhance learning. Hundreds of thousands of students from over 1,200 schools have completed surveys since 1999, the first year that the NSSE was administered. Among the many questions on the NSSE, students were asked how often they were assigned a paper of 20 pages or more during the academic year. For a sample of 19 institutions classified as national universities that made their data publicly available through the U.S. News & World Report Web site, here are the percentages of students who said they were assigned between 5 and 10 20-page papers:

0 5 3 3 1 10 2
2 3 1 2 4 2 1
1 1 4 3 5

a. Create a histogram of grouped data using 5 intervals.

b. How many schools had 6% or more of their students reporting that they wrote between 5 and 10 20-page papers that year?

c. How is the data distributed?