Normal Random Variable) Suppose that X1 is a N(3,15) r.v., and X2 is a N(10,6) r.v., independent from X1. Express P (X1 + X2 ≥ z) in terms of the probabilities of the standard normal.

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(Normal Random Variable) Suppose that X1 is a N(3,15) r.v., and X2 is a N(10,6) r.v., independent from X1. Express P (X1 + X2 ≥ z) in terms of the probabilities of the standard normal.

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