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  4. If X is a random variable such that σ(X) = 2.6, then σ(1 - 4X) is equal to,

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Q. If X is a random variable such that $\sigma$(X) = 2.6, then $\sigma$(1 - 4X) is equal to,

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Solution:

$\sigma\left(a+bx\right) = \left|b\right| \sigma\left(x\right)$