Multiple Choice Questions on The standard deviation sigma of the first N natural numbers can be obtained using which one of the f........... for NDA Exam Preparation

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Multiple Choice Questions

The standard deviation sigma of the first N natural numbers can be obtained using which one of the f...........

Mathematics (NDA) Statistics
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    The standard deviation σ of the first N natural numbers can be obtained using which one of the following formulae?

    \sigma =\frac{N^{2}-1}{12}

    Incorrect Answer

    \sigma =\sqrt{\frac{N^{2}-1}{12}}

    Correct Answer

    \sigma =\sqrt{\frac{N^{2}+1}{12}}

    Incorrect Answer

    \sigma =\sqrt{\frac{N^{2}-1}{6N}}

    Incorrect Answer
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