If the standard deviation of a variable \( X \) is \( \sigma \), th...
If the standard deviation of a variable \( X \) is \( \sigma \), then the
\( \mathrm{P} \) standard deviation of variable \( \frac{a X+b}{c} \) is
W
(1) \( a \sigma \)
(2) \( \frac{a}{c} \sigma \)
(3) \( \frac{c}{a} \sigma \)
(4) \( \frac{a \sigma+b}{c} \)
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