The textbook formula for the variance of the discrete random variable Y is given as Another commonly used formulation is .
Prove that the two formulas are the same.

Question

The textbook formula for the variance of the discrete random variable Y is given as  Another commonly used formulation is  .
Prove that the two formulas are the same.

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The Answer of The textbook formula for the variance of the discrete random variable Y is given as  Another commonly used formulation is  .
Prove that the two formulas are the same.

The Textbook Formula for the Variance of the Discrete Random