24. Find the standard deviation and...
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24. Find the standard deviation and the variance of first n natural numbers. 1 ?-1 on-1 (2) 12 nin (3) n-1 (4) None of these

11th - 12th Class
Maths
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( S cdot D=sqrt{frac{varepsilon^{2} n^{2}}{n}+left(frac{sum x}{n}right)^{2}} ) ( sum n^{2} ) for neirst ( n ) natwral mumbers [ =frac{n(n+1)(2 n+1)}{6} ] ( sum x ) for fisst ( n ) mfulal no. [ =frac{n(n+1)}{2} ] subshtwhing we gel [ S cdot D=sqrt{frac{n^{2}-1}{12}} ] 24.5 (d) None of these
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