This book offers an introduction to Probability and Statistics, complementary disciplines concerned with the analysis of randomness in the real world. Probability, roughly speaking, describes the random variation in systems, while Statistics uses sample data to draw general conclusions about a population. The book is written with first-year Masters students in engineering and other technical disciplines in mind, but it can also be used for advanced undergraduates or practitioners. Most of the content can be completed in one solid semester, or alternatively in a more leisurely two-course sequence.