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Reading 4b: Discrete Random Variables: Expected Value

Reading 4b: Discrete Random Variables: Expected Value

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1.1 Mean and center or mass You may have wondered why we use the name ‘probability mass function’. Here’s the reason: if we place an object of mass p(x j) at position x j for each j, then E(X) is the position of the center of mass. Let’s recall the latter notion via an example.

  Mass

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