General Studies · Probability Distributions
If a random variable X has a mean of zero and variance σ2, then the second central moment of X is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1E(|X|)
- 2E(X2)
- 3σ2✓
- 4σ
Correct answer
σ2
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