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2.Given random variables X 1 , X 2 and X 3 are identically, independently and normally distributed with mean and variance 2 .If Y =

2.Given random variables X₁, X₂and X₃ are identically, independently and normally

distributed with mean and variance ².If Y = 2X₁+X₂-2X₃, what is expected

value and standard deviation of Y. (check this)

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