The concept of this book is very clear and vivid, and is to guide the learners in the most easy and simple way. Here the endeavour is to present the details in brief and to-the-point manner, so that learner can use it as a ready reference, for the purpose of class-room study, examination and real-life application. The book includes topics like descriptive measures for data, probability and theoretical distributions, sampling, testing of hypothesis for parametric and non-parametric statistics, correlation and regression, and topics from operation research like linear programming, transportation, assignment, game theory etc. I am sure this book would be of much help to the beginners, without any basic knowledge of statistics, students, teachers and enthusiastic readers. It would be, specially, fruitful for the graduate students, as well as the undergraduate students also; apart from those who deal with research and higher education.