### Abstract

*Introduction to Probability Models, Ninth Edition,* is the primary text for a first undergraduate course in applied probability. This updated edition of Ross's classic bestseller provides an introduction to elementary probability theory and stochastic processes, and shows how probability theory can be applied to the study of phenomena in fields such as engineering, computer science, management science, the physical and social sciences, and operations research. With the addition of several new sections relating to actuaries, this text is highly recommended by the Society of Actuaries.

This book now contains a new section on compound random variables that can be used to establish a recursive formula for computing probability mass functions for a variety of common compounding distributions; a new section on hiddden Markov chains, including the forward and backward approaches for computing the joint probability mass function of the signals, as well as the Viterbi algorithm for determining the most likely sequence of states; and a simplified approach for analyzing nonhomogeneous Poisson processes. There are also additional results on queues relating to the conditional distribution of the number found by an M/M/1 arrival who spends a time t in the system; inspection paradox for M/M/1 queues; and M/G/1 queue with server breakdown. Furthermore, the book includes new examples and exercises, along with compulsory material for new Exam 3 of the Society of Actuaries.

This book is essential reading for professionals and students in actuarial science, engineering, operations research, and other fields in applied probability.

A new section (3.7) on COMPOUND RANDOM VARIABLES, that can be used to establish a recursive formula for computing probability mass functions for a variety of common compounding distributions.A new section (4.11) on HIDDDEN MARKOV CHAINS, including the forward and backward approaches for computing the joint probability mass function of the signals, as well as the Viterbi algorithm for determining the most likely sequence of states.

Simplified Approach for Analyzing Nonhomogeneous Poisson processes

Additional results on queues relating to the

(a) conditional distribution of the number found by an M/M/1 arrival who spends a time t in the system,;

(b) inspection paradox for M/M/1 queues

(c) M/G/1 queue with server breakdown

Many new examples and exercises.

Praise from Reviewers:

“This is a fascinating introduction to applications from a variety of disciplines. Any curious student will love this book."

- Jean LeMaire, University of Pennsylvania

“I think Ross has done an admirable job of covering the breadth of applied probability. Ross

writes fantastic problems which really force the students to think divergently...The examples, like the exercises are great.

- Matt Carlton, Cal Polytechnic Institute

“This book may be a model in the organization of the education process. I would definitely rate

this text to be the best probability models book at its level of difficulty...far more sophisticated and deliberate than its competitors.

- Kris Ostaszewski, University of Illinois