JEE PYQ: Statistics Question 34
Question 34 - 2019 (11 Jan Shift 1)
The outcome of each of 30 items was observed; 10 items gave an outcome $\frac{1}{2} - d$ each, 10 items gave outcome $\frac{1}{2}$ each and the remaining 10 items gave outcome $\frac{1}{2} + d$ each. If the variance of this outcome data is $\frac{4}{3}$ then $|d|$ equals:
(1) $\frac{2}{3}$ (2) 2 (3) $\frac{\sqrt{5}}{2}$ (4) $\sqrt{2}$
Show Answer
Answer: (4) $\sqrt{2}$
Solution
$d^2 = 2$, $|d| = \sqrt{2}$.
BETA
