Languages in the Hmong-Mien language family, also referred to as the Miao-Yao language family, are spoken across Southeast Asia and mountainous areas of southern China.
在图形上，正态分布是一种钟形曲线，越接近中心，取值越大，越远离中心，取值越小。
In its graphical representation, the normal distribution is a bell-shaped curve, with the value growing as one moves closer to the middle and decreasing as one moves away.