1.

The standard deviation σ of the first N natural numbers can be obtained using which one of the following formulae?

A. \({\rm{\sigma }} = \frac{{{{\rm{N}}^2} - 1}}{{12}}\)
B. \({\rm{\sigma }} = \sqrt {\frac{{{{\rm{N}}^2} - 1}}{{12}}} \)
C. \({\rm{\sigma }} = \sqrt {\frac{{{\rm{N}} - 1}}{{12}}}\)
D. \({\rm{\sigma }} = \sqrt {\frac{{{{\rm{N}}^2} - 1}}{{6{\rm{N}}}}}\)
Answer» C. \({\rm{\sigma }} = \sqrt {\frac{{{\rm{N}} - 1}}{{12}}}\)


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