The relative frequency of fraternal twins has halved since 1950.

【frequency】自 1950 年以来，双卵性双胞胎的相对发生率下降了一半。

We took the relative frequency of each of the numbers in the population and we multiply that outcome times its relative frequency, and we're adding it up.

我们获取了人口中每个数字的相对频率，然后将该结果乘以其相对频率，然后将其相加。

He first gives in detail all the many points of structure which vary in the several species, and estimates numerically the relative frequency of the variations.

他首先详细给出了在几个物种中变化的所有许多结构点， 并用数字估计了变化的相对频率。

The Law of Large Numbers: As the number of repetitions of an experiment increases, the observed relative frequency of an event converges to its theoretical probability.

大数定律：随着实验重复次数的增加，观察到的事件相对频率会收敛到其理论概率。

So we would get the exact same number, but what's interesting here is that this tells you just the frequencies-- really the relative frequencies of the 3's, the 4's, and the 5's.

所以我们会得到完全相同的数字，但这里有趣的是， 这只告诉你频率——实际上是 3、4 和 5 的相对频率。

This winnowing effect together with a strong cultural predilection for marrying and reproducing only within the Ashkenazi community, would have amplified the relative frequency of carriers, boosting TB resistance but increasing the incidence of Tay-Sachs as an unfortunate side effect.

这种风选效应加上仅在德系犹太人社区内结婚和生育的强烈文化偏好， 会增加携带者的相对频率，增强结核病抵抗力， 但不幸的副作用是会增加泰-萨克斯病的发病率。