Stats & Prob

• random variable - is a result of chance event, that you can measure or count.
• random variable - a numerical quantity that is assigned to the outcome of an experiment. It is a variable that assumes numerical values associated with the events of an experiment.
• If two coins are tossed once, which is NOT a possible value of the random variable for the number of heads?

  3 or three
• A random variable may be classified as:

  1. discrete - has a countable number of possible values
  2. continuous - can assume an infinite number of values in one or more intervals.
• Discrete Random Variable - takes on only certain specific values (integer) and has no interval between them.
• Continuous Random Variable - takes on any real numbers within its range and there are infinitely many values it could take.
• A discrete random variable has a countable number of possible values.
• A continuous random variable can assume an infinite number of values in one or more intervals.
• Discrete and Continuous Random Variable

  A) Discrete

  B) Continuous