A bag contains 30 white, 10 red balls.

Question

A bag contains 30 white, 10 red balls. 16 balls drawn with replacement. $X$=white balls drawn. Find $\dfrac{	ext{Mean}(X)}{	ext{SD}(X)}$.

Accepted Answer

$p=\dfrac34,q=\dfrac14,n=16$.

$$\frac{np}{\sqrt{npq}} = \sqrt{\frac{np}{q}} = \sqrt{16\times3}=4\sqrt3$$

Solutions · 1