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If the mean and the standard deviation ...

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 :

A

`x^2 - 10x + 18=0`

B

`2x^2 -20x + 19=0`

C

`x^2-10x+19=0`

D

`x^2-20x+18=0`

Text Solution

Verified by Experts

The correct Answer is:
C
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