$($a$)$ Suppose $x$ is a random variable and the pmf is given by

$\backslash$table$[[x,0,1,2,3,4],[p(x),0\mathrm{.}08,,0\mathrm{.}15,0\mathrm{.}45,0\mathrm{.}27,0\mathrm{.}05]]$

Compute the following $E(x),V(x)$ and $(x).$