JEE Main 2018 — Statistics Question with Solution
From: JEE Main 2018 (Online) 15th April Evening Slot
Question
If the mean of the data : 7, 8, 9, 7, 8, 7, , 8 is 8, then the variance of this data is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B1
Step-by-step explanation
= = 8
= 8 = 10
Now variance = 2
=
2 = = = 1
Hence, the variance is 1.
= 8 = 10
Now variance = 2
=
2 = = = 1
Hence, the variance is 1.
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This is a previous-year question from JEE Main 2018, 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.