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Which of the Following Formulas Will Compute the Variance of a Discrete

Question 43

Multiple Choice

Which of the following formulas will compute the variance of a discrete random variable X?


A) ∑j=1n(xj−E[X]2) \sum_{j=1}^{n}\left(x_{j}-E[X]^{2}\right)

B) ∑j=1∞E[X]2f(xj) \sum_{j=1}^{\infty} \mathrm{E}[X]^{2} f\left(x_{j}\right)

C) ∑j=1∞(xj−E[X]) 2f(xj) \sum_{j=1}^{\infty}\left(x_{j}-E[X]\right) ^{2} f\left(x_{j}\right)

D) ∑j=1∞(xj) 2f(xj) \sum_{j=1}^{\infty}\left(x_{j}\right) 2 f\left(x_{j}\right)

Correct Answer:

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