NCERT Book for Class 6 Maths PDF (Revised Edition for 2025-26): The latest edition of the NCERT Class 6 Maths Book is available for free download. Published by the National Council of Educational ...
There are two formulae for standard deviation. \(s = \sqrt {\frac{{\sum {{{(X - \bar X)}^2}} }}{{n - 1}}}\) (where n is the sample size). The second formula is a re ...
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