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Q9) A stock solution of hydrochloric acid (HCI) supplied by a certain vendor contains small amounts of several impurities, including copper and nickel. Let

Q9) A stock solution of hydrochloric acid (HCI) supplied by a certain vendor contains small amounts of several impurities, including copper and nickel. Let X denote the amount of copper and let Y denote the amount of nickel, in parts per ten million, in a randomly selected bottle of solution. Assume that the joint probability density function of X and Y is given by 0

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