JEE Main 2020 — Statistics Question with Solution
From: JEE Main 2020 (Online) 5th September Evening Slot
Question
If the mean and the standard deviation of the
data 3, 5, 7, a, b are 5 and 2 respectively, then a and b are the roots of the equation :
data 3, 5, 7, a, b are 5 and 2 respectively, then a and b are the roots of the equation :
Choose an option
Show full solutionCorrect option: D
Correct answer
Dx2 – 10x + 19 = 0
Step-by-step explanation
Mean = = 5
+ b = 10
Variance = - (5)2 = 4
= 62
= 62
= 19
So and b are the roots of the equation
x2 – 10x + 19 = 0
+ b = 10
Variance = - (5)2 = 4
= 62
= 62
= 19
So and b are the roots of the equation
x2 – 10x + 19 = 0
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