# 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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