If $x$ is a binomial random variable, compute the mean, the standard deviation, and the variance for each of the following cases:

(a) $n = 3, p = 0.9$
$\mu =$
$\sigma^2 =$
$\sigma =$

(b) $n = 5, p = 0.5$
$\mu =$
$\sigma^2 =$
$\sigma =$

(c) $n = 3, p = 0.2$
$\mu =$
$\sigma^2 =$
$\sigma =$

(d) $n = 6, p = 0.7$
$\mu =$
$\sigma^2 =$
$\sigma =$