I used this book for a engineering probabilities class. The prof. was one of those less than helpful types who tossed out a lecture and then let the class sink or swim. If that hadn't been the case maybe I would have rated the book higher, but since I was pretty much using this as my sole source of learning it was not helpful at all.It's written in more of a conversational tone; which isn't always a bad thing. However the equations shown and the dervations the author goes through are not well documented neither are they intuitive to follow. Does every math book need to be easy and intuitive? No, they don't. But if they bill themselves as a "beginner's guide" then they probably should.(A friend in the class told me to pick up the Idiot's Guide to Probablity and we used that as our textbook instead. We we're the only two to get A's in that class)