Mathematics · 2022
JEE Main · 27 July 2022, Shift 1 · Q22
The mean and variance of 10 observations were calculated as 15 and 15 respectively by a student who took by mistake 25 instead of 15 for one…
The mean and variance of $\displaystyle 10$ observations were calculated as $\displaystyle 15$ and $\displaystyle 15$ respectively by a student who took by mistake $\displaystyle 25$ instead of $\displaystyle 15$ for one observation. Then, the correct standard deviation is \_\_\_\_.
Official answer
2
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JEE Main 2022 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.