A random variable X follows binomial distribution with mean α and variance β. Then which relation between α and β is correct?
Answer & explanation
Correct answer: option 2
Suppose X = B(n.p) then
$\alpha = np , \beta = npq$
As $0< q <1 , \text { we get }0 < npq < np$
$ \Rightarrow \alpha > \beta > 0$