Random Variables

• Their values cannot be predicted accurately. 
• Formally, a random variable is a function that assigns a real number to each outcome in the sample space of a random experiment.
• Examples include:
  • The number of students passing an exam out of 25 students.
  • The time to the first failure of a computer which is known to fail, on average, once a year.
  • The temperature on any given day.

  L. K. Gaafar