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Biostatistics by P. Mariappan

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Chapter 9

Random Variables and Expectation

Objectives

After completing this chapter, you can understand the following:

  • The definition, meaning and significance of random variable.
  • The concept of expectation and its applications.
  • Concept related to probability distribution.
9.1 INTRODUCTION

We know that an experiment refers to an activity/measurement that results in an outcome. Clearly, tossing of a single coin is an experiment. When we toss a coin, we don’t know whether it will turn head or tail and the chance of the head is half and the tail is half. An experiment is said to be a random experiment if its outcome depends on chance. A random variable can be defined based on the random experiment. Usually the random variable is used to define ...

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