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If $$\sigma$$ is the standard deviation of $$x_1, x_2, ...... x_n$$, then the standard deviation of $$9 + 3x_1, 9 + 3x_2, ....., 9 + 3x_n$$ is
$$3 \sigma - 3$$
$$\sqrt{9 \sigma^2 + 3}$$
$$3 \sigma$$
$$3 \sigma + 9$$
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