Random Variable in Statistics


Random Variable 

  • A random variable is a variable whose value is unknown or a function that assigns values to each of an experiment's outcomes.
  • A random variable can be classified as discrete or continuous depending upon the numerical value it assumes
For Example: Let’s look at a very commonly used example of a coin toss, suppose you flip a coin 100 times, 
  1. How many times you will get a head?
  2. Will you always get consecutive 5 heads?

Types of Random Variable 

  • Discrete Random Variable: Variables assume only a countable number of values such as 1,2,3 , 4 ,5
Example: Attendance in a class, No of attendees in the seminar

  • Continuous Random Variable: Any of the countless number of values in an interval such as: 1.1, 1.2, 1.3……….
Example: Height , Weight, Amount of Sugar in fruit etc.

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