Computing the Variance and Standard Deviation

• Steps in Finding the Variance and Standard deviation

  1.  Find the mean of the probability distribution.
  2. Subtract the mean from each value of a random variable X.
  3.  Square the results obtained in Step 2.
  4.  Multiply the results obtained in Step 3 by the corresponding probability.
  5. Get the sum of the results obtained in Step 4.