<image> During the big clean-up, the students of Class 3, Grade 6 were divided into 4 groups, with the number of people in each group shown in the diagram:
(1) ____ has the most people.
(2) The number of people cleaning windows accounts for ____% of the total number of people in Class 3, Grade 6.
(3) The total number of people in the class is ____.
(4) There are ____ people sweeping the floor.