Offline paper
Mathematics · 2016
JEE Main 2016 · 2016-04-03 Offline · Q86
If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true?
If the standard deviation of the numbers $\displaystyle 2$, $\displaystyle 3$, $\displaystyle a$ and $\displaystyle 11$ is $\displaystyle 3.5$, then which of the following is true ?
Official answer
(2)
$\displaystyle 3 a^2-32 a+84=0$
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JEE Main 2016 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.