IANAL. But, what's your consideration such that you think this usage of the books wouldn't be "fair use"?
e.g. in the US https://en.wikipedia.org/wiki/Fair_use factors of fair use are "purpose/character of the work", "nature of the copyrighted work", "amount/substantiality of the copyrighted work", "effect on the market for the copyrighted work".
The website shows a few statistics computed from a book, and a few excerpts from the book.
I'd think a consideration of those fair use factors favours the website: e.g. you're not going to look at those statistics/excerpts instead of reading the book. The website only shows a small portion of the book. The website's intention is to be educational.
e.g. in the US https://en.wikipedia.org/wiki/Fair_use factors of fair use are "purpose/character of the work", "nature of the copyrighted work", "amount/substantiality of the copyrighted work", "effect on the market for the copyrighted work".
The website shows a few statistics computed from a book, and a few excerpts from the book.
I'd think a consideration of those fair use factors favours the website: e.g. you're not going to look at those statistics/excerpts instead of reading the book. The website only shows a small portion of the book. The website's intention is to be educational.