Mathematics · 2018
JEE Main · 16 April 2018, Shift 1 · Q85
The mean and the standard deviation(s.d.) of five observations are 9 and 0, respectively. If one of the observations is changed such that the mean of…
The mean and the standard deviation(s.d.) of five observations are $\displaystyle 9$ and $\displaystyle 0$ , respectively. If one of the observations is changed such that the mean of the new set of five observations becomes $\displaystyle 10$, then their s.d. is :
Official answer
(3)
$\displaystyle 2$
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JEE Main 2018 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.