Mathematics · 2019
JEE Main · 11 January 2019, Shift 1 · Q86
The outcome of each of 30 items was observed; 10 items gave an outcome 1/2 - d each, 10 items gave outcome 1/2 each and the remaining 10 items gave…
The outcome of each of $\displaystyle 30$ items was observed; $\displaystyle 10$ items gave an outcome $\displaystyle \frac{1}{2}$ - d each, $\displaystyle 10$ items gave outcome $\displaystyle \frac{1}{2}$ each and the remaining $\displaystyle 10$ items gave outcome $\displaystyle \frac{1}{2}+\mathrm{d}$ each. If the variance of this outcome data is $\displaystyle \frac{4}{3}$ then $\displaystyle |\mathrm{d}|$ equals :
Official answer
(1)
$\displaystyle \sqrt{2}$
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.