JEE Main 2019 — Statistics Question with Solution
From: JEE Main 2019 (Online) 8th April Evening Slot
Question
A student scores the following marks in five tests
:
45, 54, 41, 57, 43.
His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is
45, 54, 41, 57, 43.
His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Let the score in the sixth test = x
Given, Mean () = 48
= 48
x = 48
Standard deviation (SD)
=
=
=
=
=
=
Given, Mean () = 48
= 48
x = 48
Standard deviation (SD)
=
=
=
=
=
=
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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.