Which expression represents the variance of a random variable XXX?
E[X2]−E[X]2E[X^2] - E[X]^2E[X2]−E[X]2
E[(X−μ)2]E[(X - \mu)^2]E[(X−μ)2]
E[X2]+E[X]2E[X^2] + E[X]^2E[X2]+E[X]2
E[∣X−μ∣]E[|X - \mu|]E[∣X−μ∣]