A binomial distribution has mean 8 and variance 4.8. What are $n$ and $p$?

Explanation

1. 01

   $\frac{npq}{np} = q = \frac{4.8}{8} = 0.6$, so $p = 0.4$.

2. 02

   $n = \frac{8}{0.4} = 20$.