The random variable X and Y are independent, and their distributions are normal, with E(X) = 1000, E(Y ) = 900, StDev(X) = 300, and StDev(Y ) = 400.

Part 1

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What can you say about the random variable (X-Y)?

Compute E[X-Y] unanswered

Compute the standard deviation of [X-Y] unanswered

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Part 2

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Compute)