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If the standard deviation of a variable `xi ssigma` , then standard deviation of variable `(a X+b)/c` is `asigma` (b) `a/csigma` (c) `|a/c|sigma` (d) `(asigma+b)/c`

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If the standard deviation of a variable X \ is \ sigma , then standard deviation of variable (a X+b)/c is (a) asigma (b) a/csigma (c) |a/c|sigma (d) (asigma+b)/c

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