A fair coin is tossed 5 times. Find the probability of obtaining exactly 3 heads.

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$X$ has a binomial distribution with $n = 10$ and $p = \frac{1}{5}$ . Find $Var (X)$ .
$X$ has a binomial distribution with $n = 20$ and $p = \frac{1}{4}$ . Find $Var (X)$ .
$X$ has a binomial distribution with $n = 12$ and $p = \frac{1}{3}$ . Find $Var (X)$ .
$X$ has a binomial distribution with $n = 15$ and $p = \frac{2}{5}$ . Find $Var (X)$ .
$X$ has a binomial distribution with $n = 30$ and $p = \frac{1}{6}$ . Find $Var (X)$ .
$X$ has a binomial distribution with $n = 24$ and $p = \frac{1}{2}$ . Find $Var (X)$ .