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If E denotes expectation, the variance of a random variable X is given by
  • a)
    E [X2] – E2[X]
  • b)
    E[X2]  + E2[X]
  • c)
    E [X2]
  • d)
    E2[X]
Correct answer is option 'A'. Can you explain this answer?
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If E denotes expectation, the variance of a random variable X is given bya)E [X2] – E2[X]b)E[X2] + E2[X]c)E [X2]d)E2[X]Correct answer is option 'A'. Can you explain this answer?
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