The Random Variable X Represents the Number of Computers That

Multiple Choice

The random variable x represents the number of computers that families have along with the correspondingprobabilities. 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