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Question 21

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 If random variables x1 and x2 are independent, then σx1+x22=σx12+σx22\text { If random variables } x _ { 1 } \text { and } x _ { 2 } \text { are independent, then } \sigma _ { x _ { 1 } + x _ { 2 } } ^ { 2 } = \sigma _ { x _ { 1 } } ^ { 2 } + \sigma _ { x _ { 2 } } ^ { 2 }

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