The following data were collected in a study in which 30 students were asked to rate their professors: very good, good, good, fair, excellent, good, good, very good, fair, good, good, excellent, very good, good, good, good, fair, very good, good, very good, excellent, very good, good, fair, fair, very good, very good, good, good, and excellent. Draw a pie chart to represent the data.