JEE Main 2022 — Statistics Question with Solution
From: JEE Main 2022 (Online) 28th June Morning Shift
Question
The mean and standard deviation of 15 observations are found to be 8 and 3 respectively. On rechecking it was found that, in the observations, 20 was misread as 5. Then, the correct variance is equal to _____________.
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Show full solutionCorrect answer: 17
Step-by-step explanation
Let be corrected mean = 9
Correct variance
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This is a previous-year question from JEE Main 2022, covering the Statistics chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.