If X is a normal random variable with a standard deviation of 10, then 3X has a standard deviation equal to: $\begin{array}{|l|l|}
\hline\text { A. } & 10 . \
\hline \text { B. } & 13 . \
\hline \text { C. } & 30 . \
\hline \text { D. } & 90 . \
\hline
\end{array}$

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The Answer of If X is a normal random variable with a standard deviation of 10, then 3X has a standard deviation equal to: $\begin{array}{|l|l|}
\hline\text { A. } & 10 . \
\hline \text { B. } & 13 . \
\hline \text { C. } & 30 . \
\hline \text { D. } & 90 . \
\hline
\end{array}$

If X Is a Normal Random Variable with a Standard