JEE Main 2019 — Statistics Question with Solution
From: JEE Main 2019 (Online) 9th April Morning Slot
Question
If the standard deviation of the numbers
–1, 0, 1, k is where k > 0, then k is equal to
Choose an option
Show full solutionCorrect option: A
Correct answer
A2
Step-by-step explanation
standard deviation =
Variance = = 5
Also variance =
Where = Mean = =
Variance = -
5 = -
8 + 3k2 = 80
k2 = 24 = 2
Variance = = 5
Also variance =
Where = Mean = =
Variance = -
5 = -
8 + 3k2 = 80
k2 = 24 = 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.