频数分布又叫正态分布,它是数理统计中应用最广泛的统计方法,这是因为①、很多生物学的变数频数分布均近似于正态分布,如鱼的体长等,当我们所取得的样品数愈大(上百上千),则所做出的频数分布图愈接近一个图滑的“n”形正态分布图,就是说,大多数样品的变数都靠近中 Frequency distribution, also known as normal distribution, which is the most widely used statistical methods in mathematical statistics, because ①, many biological variables frequency distribution are similar to the normal distribution, such as fish body length, when we have made The larger the number of samples (hundreds of thousands), the frequency distribution made by the map closer to a slip “n” -shaped normal distribution, that is, most of the samples are close to the variable