Mean of a Discrete Random Variable

Statistics and Probability / Random Variables and Probability Distributions

Sample Question

What is the formula for finding the mean of a discrete random variable?

  • [% \mu_x=\Sigma x_i\cdot P\left ( x_i \right )%]
  • [%\mu_x=\displaystyle\Sigma \left[x_i\cdot P\left ( x_i \right )\right]%]
  • [% \mu_x= x_i\cdot\Sigma P\left ( x_i \right )%]
  • [% \mu_x=P\left ( x_i \right )\cdot\Sigma x_i %]

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Statistics and Probability