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Suppose the random variable x has mean 8.5 and standard deviation 5.3, the random variable y has mean 1.1 and standard deviation 6.4 and we

Suppose the random variable x has mean 8.5 and standard deviation 5.3, the random variable y has mean 1.1 and standard deviation 6.4 and we define the random variable W = x - y. Then w has mean equal to?

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