On May 19, the first tourism day in China was officially launched. A school organized a knowledge contest on tourism geography, in which 800 students from 8th grade participated. To understand,

(2) The central angle is 108.

(3)∫800×480 (person),

(1) Divide the failure rate by the number of students to get the number of students;

(2) The passing rate is equal to the number of people who have passed the exam, and then the excellent rate and the number of people are obtained. Multiply the passing percentage by 360 degrees to obtain the degree representing the central angle of the passing sector;

(3) Calculate the percentage of students and excellent students first, and then multiply it by 800.