The $S.D.$ of a variate $x$ is $\sigma$. The $S.D.$ of the variate $\frac{ax + b}{c}$,where $a, b, c$ are constants,is
- A$\left( \frac{a}{c} \right) \sigma$
- B$\left| \frac{a}{c} \right| \sigma$
- C$\left( \frac{a^2}{c^2} \right) \sigma$
- DNone of these
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