Question

Find the​ mean, variance, and standard deviation of the binomial distribution with the given values of n and p.

Answer 1

We don't know what $n$ and $p$ are, but we can derive the mean and variance with the general parameters using the PMF of the distribution. It's a tedious bit of work, so I'll cut to the chase:

$\text{mean}=np$
$\text{variance}=np(1-p)$
$\text{standard deviation}=\sqrt{\text{variance}}=\sqrt{np(1-p)}$