यदि sum(i=1)^(9)(x(i)-5)=9 तथा sum(i=1)...

यदि `sum_(i=1)^(9)(x_(i)-5)=9` तथा `sum_(i=1)^(9)(x_(i)-5)^(2)=45` है तब 9 अवयवों `x_(1),x_(2), . . .. . .. x_(9)` का मानक विचलन है -

A

9

B

4

C

2

D

3

Verified by Experts

The correct Answer is:

C

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