JEE Main 2019 — Statistics Question with Solution
From: JEE Main 2019 (Online) 11th January Morning Slot
Question
The outcome of each of 30 items was observed; 10 items gave an outcome – d each, 10 items gave outcome each and the remaining 10 items gave outcome + d each. If the variance of this outcome data is then |d| equals :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
Variance is independent of region. So we shift the given data by .
so,
d2 2
so,
d2 2
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This is a previous-year question from JEE Main 2019, 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.