18. The variance of a set of data i...
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18. The variance of a set of data is 169. Then the standard deviation of the data is : RRB NTPC (Phase I) 2016 (1) + 13 (2) 13 (3) 69 (4) 84.5

11th - 12th Class
Maths
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18. (2) Standard deviation ( =sqrt{text { Variance }} ) ( =sqrt{169}=13 )
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