Question

A die is thrown 5 times. Getting an odd number considered as success, then variance of distribution is

• A. $\frac{8}{3}$
• B. $\frac{3}{8}$
• C. $\frac{4}{5}$
• D. $\frac{5}{4}$

Answer 1

Answer: (D)

$\frac{5}{4}$

$n=5$, $p=q=1/2$ since probability of getting even and odd are same.
$\therefore$ Variance is ${\sigma }^2=npq=\frac{5}{4}$