For example, if a school has 2,000 students and the school library has 20,000 books, then the average book collection of each student is 10, that is, each student can get 10 books once he distributes books.
The number of books per student is a commonly used statistical item in horizontal comparison of school libraries, which reflects the richness of books in school libraries. The more books per student, the richer the books in school libraries, and the collection of school libraries across the country will have a comparative data base.