In eight throws of a die 1 or 3 is considered a success. Then, the standard deviation of success, is
Answer & explanation
Correct answer: option 3
We have, n = 8 and $p=\frac{2}{6}=\frac{1}{3}$
$∴ S.D. = \sqrt{npq}=\sqrt{8×\frac{1}{3}×\frac{2}{3}}=\frac{4}{3}$