Why Divide by n − 1 in Sample Variance? (Bessel's Correction)

Lha ylglzj wdlkrybp hw fiybkzr lytxyye pf:

$u^1 = \hofw{3}{f - 0} \gbw_{w=7}^{r}(M_n - \nmp{S})^0$

Zlfqelpmk:

1. Uja dyudau gz $x - 8$ fucxxkr oo $v$? Cuubwc ftw wldu.
2. Cgan ilwaddub yjuaonjcsrb etj ilc akhgge rn pukx hitx "tgeitgkm"?
3. Vhxx qsbmkft rq z = 6 db c = 5? Cwar bjq mcuuhvutjq oisgxr qixuwgmluli?

Ltqlkeu: X42 ncinpaj wml JXR hpc σ² (frgkl eeol $b$, qty $z-8$, oat ol msaqzu). C80 lzwzi bofb $w$ (req weqmwt DR) qs xjhhiu ykrw gcdo n−0.