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4 5 points If X1 ~ N(a, c), X2~ N(b, d) and they are independent, then (X2 -(a+b))/ sqrt(c^2 + d^2) ~ O N (-a,

4 5 points If X1 ~ N(a, c), X2~ N(b, d) and they are independent, then (X2 -(a+b))/ sqrt(c^2 + d^2) ~ O N (-a, 1) O N(b, 1) O N(-2b, 1) O N(a, 1) O None of the above

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