E(x1 - x2)= ___________________?
Correct answer: B. u1 - u2
- A. ux - x2
- B. u1 - u2
- C. 6x - x2
- D. 6×2 - x2
Explanation
Expectation is linear, so E(X₁ − X₂) = E(X₁) − E(X₂) = μ₁ − μ₂. This remains true even when the two variables are not independent.
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