Mathematics · 2017
JEE Main · 9 April 2017, Shift 1 · Q87
The sum of 100 observations and the sum of their squares are 400 and 2475, respectively. Later on, three observations, 3, 4 and 5, were found to be…
The sum of $\displaystyle 100$ observations and the sum of their squares are $\displaystyle 400$ and $\displaystyle 2475$, respectively. Later on, three observations, $\displaystyle 3$, $\displaystyle 4$ and $\displaystyle 5$, were found to be incorrect. If the incorrect observations are omitted, then the variance of the remaining observations is :
Official answer
(4)
$\displaystyle 9.00$
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JEE Main 2017 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.