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GATE Mechanical 2014 Set 1 | Question: 28

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In the following table, $x$ is a discrete random variable and $p(x)$ is the probability density. The standard deviation of $x$ is

$$\begin{array}{|c|c|c|c|} \hline x & 1 & 2 & 3 \\ \hline p(x) & 0.3 & 0.6 & 0.1 \\ \hline \end{array}$$

  1. $0.18$
  2. $0.36$
  3. $0.54$
  4. $0.60$

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