Use the following information to answer question 15-17.
Miriam conducted a survey of the students in her 8th-grade class to determine which of 7 Olympic sports were the most popular. Each student who responded to the survey selected 1 Olympic sport as his or her favorite. The circle graph below shows the number of students who selected each of the 7 Olympic sports. A total of 40 students responded to the survey.
17. In the circle graph, what is the angle measure of the sector that represents the number of students who responded to the survey who selected Tennis?