Question

What are the mean and standard deviation of a binomial probability distribution with `n=12` and `p=5/21`?

Answer 1

Mean `=2 6/7`
SD `=1.475`

Explanation:

Mean `=np=12 xx 5/21=2 6/7`
SD `=sqrt(npq)`

`q=1-p=1-5/21=16/21`
SD`=sqrt(12 xx 5/21 xx 16/21)=1.475`