What Is Normal, Anyway?

I went to the library the other evening.  As I went in, a woman was standing at the counter venting to the long-suffering staff about something.  Because I walked in half way through, I don't know what her complaint was (I have a feeling she was annoyed at getting fined for returning books late), but I was in time to hear this pearl of wisdom:

"a normal person doesn't read more than one book a week"