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5. (Type B) Assume that three random variables A, B and C with standard deviations GA=V2 6 . OB= OC=0. they are all independent and

5. (Type B) Assume that three random variables A, B and C with standard deviations GA=V2 6 . OB= OC=0. they are all independent and uncorrelated. There is a random variable X=3A-5B+2C, and what is the standard deviation of the random variable X

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