Practice question

MCQ

Question

If X is a random variable with Mean μ, then the variance of X, denoted by Var (X) is given by:

Choose one · Correct answer highlighted

Var (X) = E[X] - μ² Var (X) = E[X²] - μ Var (X) = E[(X - μ)]² Correct Var (X) = E[(X - μ)]

We can see that complete solution: write formula, plug data, do arithmetic. Final value matches Var (X) = E[(X - μ)]². Simple and accurate.

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