Compute the Variance and Standard Deviation of a Discrete Random $x$

Multiple Choice

Compute the Variance and Standard Deviation of a Discrete Random Variable
-The random variable x represents the number of computers that families have along with the corresponding probabilities. Find the mean and standard deviation for the random variable $x$ .
$\begin{array}{c|c}\mathrm{x} & \mathrm{P}(\mathrm{x}) \\\hline 0 & 0.49 \\1 & 0.05 \\2 & 0.32 \\3 & 0.07 \\4 & 0.07\end{array}$

A) mean: 1.18; standard deviation: $1.30$
B) mean: 1.39; standard deviation: $0.64$
C) mean: $1.39$ ; standard deviation: $0.80$
D) mean: $1.18$ ; standard deviation: $0.64$