(2) From the bar chart, it can be found that the percentage of people who participated in the "Music Activity" project to the total number of spot checks is × 100%=25%.
Therefore, the angle of the fan-shaped central angle participating in the "Music Activity" project is 360× 25% = 90;
(3)2400×300 (person).
A: There are about 300 people participating in the "art activities" project in this school.