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Suppose X is a random variable with mean 10 and variance 16. Suppose Y is a random variable with mean 20 and variance 9. X

Suppose X is a random variable with mean 10 and variance 16.

Suppose Y is a random variable with mean 20 and variance 9.

X and Y are independent.

What is the standard deviation of the difference X - Y?

Group of answer choices

square root of 7

None of the other choices is correct

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