Question

( 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

# 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

Solution