JEE Main 2019 — Statistics Question with Solution
From: JEE Main 2019 (Online) 12th January Evening Slot
Question
The mean and the variance of five observations are 4 and 5.20, respectively. If three of the observations are
3, 4 and 4 ; then the absolute value of the difference of the other two observations, is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B7
Step-by-step explanation
mean = 4, 2 = 5.2, n = 5, . x1 = 3 x2 = 4 = x3
x4 + x5 = 9 . . . . . . (i)
. . . . . .(ii)
Using (i) and (ii) (x4 x5)2 = 49
x4 + x5 = 9 . . . . . . (i)
. . . . . .(ii)
Using (i) and (ii) (x4 x5)2 = 49
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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.