JEE Main 2021 — Statistics Question with Solution
From: JEE Main 2021 (Online) 20th July Evening Shift
Question
If the mean and variance of six observations 7, 10, 11, 15, a, b are 10 and , respectively, then the value of | a b | is equal to :
Choose an option
Show full solutionCorrect option: D
Correct answer
D1
Step-by-step explanation
a + b = 17 ..... (i)
a2 + b2 = 145 ...... (ii)
Solve (i) and (ii) a = 9, b = 8 or a = 8, b = 9
| a b | = 1
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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.