Question: When does the equality E[X ] = ELX 2 hold? always if X is binomially distributed if X is Poisson distributed if X is constant

When does the equality E[X ] = ELX 2 hold? always

if X is binomially distributed if X is Poisson distributed if X

When does the equality E[X ] = ELX 2 hold? always if X is binomially distributed if X is Poisson distributed if X is constant none of the above

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