Q. For a series the value of mean deviation is 15, the most likely value of its quartile derivation is
A) 12.5
B) 11.6
C) 13
D) 9.7
Explanation
(a)
Since, $MD = \frac{4}{5}\sigma,\ \ QD = \frac{2}{3}\sigma$
$\therefore\ \frac{MD}{QD} = \frac{6}{5}$
$\Rightarrow \ \ QD = \frac{5}{6}\ (MD) = \frac{5}{6}(15) = 12.5$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.