The Following Table Presents the Probability Distribution of the Number $\sigma _ { x }$

Multiple Choice

The following table presents the probability distribution of the number of vacations X taken last year for a randomly chosen family. Compute the standard deviation $\sigma _ { x }$

$\begin{array} { c | c c c c c } x & 0 & 1 & 2 & 3 & 4 \\\hline P ( x ) & 0.11 & 0.69 & 0.13 & 0.05 & 0.02\end{array}$

A) 1.18
B) 1.29
C) 0.59
D) 0.77