A book is randomly chosen from a library shelf. For each of the following characteristics of the book, decide whether the characteristic is a continuous or a discrete random variable:
a. Weight of the book (e.g., 2.3 pounds).
b. Number of chapters in the book (e.g., 10 chapters).
c. Width of the book (e.g., 8 inches).
d. Type of book (0 = hardback or 1 = paperback).
e. Number of typographical errors in the book (e.g., 4 errors).