If X∼Binomial(n,p)X \sim Binomial(n, p)X∼Binomial(n,p), what is the coefficient of variation CV=σ/μCV = \sigma / \muCV=σ/μ?
\sqrt{\frac{1-p}{np}}
\sqrt{\frac{p}{n(1-p)}}
\frac{1-p}{p}
\sqrt{\frac{np}{1-p}}