<image>A comprehensive practical activity group at a certain school randomly surveyed some students about their extracurricular reading habits and created a pie chart showing the average daily extracurricular reading time per student (as shown in the image). 

(1) Find the percentage data for section ④ of the pie chart;
(2) The number of students whose daily extracurricular reading time is around 60 minutes is 20. Determine the total number of surveyed students;
(3) Please estimate the average daily extracurricular reading time per student in the school through calculation.
