@[NaCly_Fish](/user/115864)
by Smile_Cindy @ 2019-11-12 17:59:45
@[littlejuruo](/user/86815) 已修复
by NaCly_Fish @ 2019-11-12 18:06:00
附正确的
$$\LaTeX$$
$\sigma=\sqrt{\dfrac{\sum\limits_{i=1}^{n}(x_i-\overline{x})^{2}}{n}}$
$\overline{x}=\dfrac{\sum\limits_{i=1}^{n}x_i}{n}$
by Smile_Cindy @ 2019-11-12 18:06:24