Question

What are the mean and standard deviation of a binomial probability distribution with `n=10` and `p=4/5`?

Answer 1

Mean `=8`
SD`=1.265`

Explanation:

Mean `=np=10xx4/5=8`
SD `=sqrt(npq)`

`q=1-p=1-4/5=1/5`
SD `=sqrt(10 xx 4/5 xx 1/5)=1.265`