This book is designed for second-year engineering students of all branches of Anna University (AU) studying the course: 1 Probability and Random Processes (ECE and Biomedical) 2 Probability and Queuing Theory (CSE&IT) The book is designed to provide a balanced coverage of both theory and application. It helps the reader acquire a thorough knowledge of the concepts of Probability, Statistics, Random Processes and Queuing Theory & Queuing Networks. Numerous examples and exercise problems in this book provide students good understanding of the subject .