JEE Main 2021 — Statistics Question with Solution
From: JEE Main 2021 (Online) 16th March Morning Shift
Question
Consider three observations a, b, and c such that b = a + c. If the standard deviation of a + 2, b + 2, c + 2 is d, then which of the following is true?
Choose an option
Show full solutionCorrect option: B
Correct answer
Bb2 = 3(a2 + c2) 9d2
Step-by-step explanation
For a, b, c
mean =
We know, S.D. of a + 2, b + 2, c + 2 = S.D. of a, b, c = d
mean =
We know, S.D. of a + 2, b + 2, c + 2 = S.D. of a, b, c = d
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This is a previous-year question from JEE Main 2021, 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.