Final answer:
The question hints at calculating the average number of books issued by the National Library over a certain period but doesn't provide enough data for that. Instead, the answer discusses book consumption trends, library usage, and the implications for publishers and libraries based on given references.
Step-by-step explanation:
The question appears to involve interpreting data regarding the number of books issued by the National Library over a period of 20 days to calculate an average. However, the provided data is insufficient to calculate this average. Instead, let's discuss book consumption trends, the impact of these trends on publishers and libraries, and how library usage statistics can be used to inform such trends, drawing on the reference information provided.
Book consumption trends show that U.S. adults read a median of five books per year, with about 69% having read at least one printed book in the past year. These trends are important for publishers to understand consumer behavior and plan accordingly. Concerning library usage, the American Library Association claims that a maximum of 67% of library patrons borrow books, but a local college statistics class survey in Owensboro, KY challenged this claim, finding that 82 out of 100 randomly selected patrons borrowed books, indicating a higher borrowing rate in the region.
The findings from these surveys and reports have implications for both publishers and libraries. Publishers, who release some 100,000 books annually, face a market where a significant portion of books may not earn back the advances paid to their authors. Understanding consumption patterns, such as preference for printed books over e-books, can help in tailoring the publishing strategy. Libraries, meanwhile, can use survey data to better meet the needs of their patrons and to assess their performance against national trends.