Mathematics · 2019
JEE Main · 8 April 2019, Shift 2 · Q86
A student scores the following marks in five tests: 45, 54, 41, 57, 43. His score is not known for the sixth test. If the mean score is 48 in the six…
A student scores the following marks in five tests : $\displaystyle 45$, $\displaystyle 54$, $\displaystyle 41$, $\displaystyle 57$, 43. His score is not known for the sixth test. If the mean score is $\displaystyle 48$ in the six tests, then the standard deviation of the marks in six tests is :
Official answer
(3)
$\displaystyle \frac{10}{\sqrt{3}}$
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.