JEE Mains Model Paper 21

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Question : 75 of 90

Marks: +1, -0

If Σ (xi - 8) = 9 and

15

Σ

i=1

(xi−8)2 = 45 then the standard deviation of x1,x2,x3 ... x15

4
9
9
4
3
2
4

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