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Suppose that X is a random variable with mean 30 and standard deviation 4. Suppose that Y is a random variable with mean 50 and

Suppose that X is a random variable with mean 30 and standard deviation 4. Suppose that Y" is a random variable with mean 50 and standard deviation 8. Assume that the correlation between X and Y is 0.5. Find the variance of the variable Z = X - Y

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