Introduction

Probability and statistics are two branches of mathematics while probability deals with the laws governing random events, statistics encompasses collection, analysis, interpretation and display of numerical data. Probability has its origin in the study of gambling and insurance in the seventeenth century, and it is now an indispensable tool of both social and natural sciences. Statistics may be said to have its origin in census counts taken thousands of years ago; as a distinct scientific discipline, however, it was developed in the early nineteenth century as the study of populations and economics, and as the mathematical tool for analyzing such numbers.