<image>After the earthquake in Ya'an, Sichuan, the student council of a certain school initiated a donation drive from all 700 students. To understand the donation situation, they randomly surveyed some students' donation amounts and used the obtained data to draw the following statistical figures ① and ②. Based on the relevant information, please answer the following questions:
(I) The number of students randomly sampled in this survey is ______, and the value of m in Figure ① is ______;
(II) Calculate the mean, mode, and median of the sample data obtained in this survey;
(III) Based on the sample data, estimate the number of students in the school who donated 10 yuan in this activity.
