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Mean and Standard Deviation of Random Variables

AP Statistics· difficulty 3/5

For a discrete RV X, E(X) =

  • A

    Σ x²

  • B

    Σ x·P(X=x)

    check_circle
  • C

    1

  • D

    Σ P(X=x)

Explanation

E(X) is the probability-weighted sum.

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