随机变量的加权平均值是期望值。
The weighted mean of the random variable is the expected value.
我们经常在金融学中假设随机变量，比如回报，是正态分布的。
We often assume in finance that random variables, such as returns, are normally distributed.
金融学中我们常假设随机变量,例如收益率,是服从正态分布的
We often assume in finance that random variables, such as returns,are normally distributed.
然而，当利率是随机变量时，目前的研究成果并不多见。
However, when the interest rate being stochastic, these are not more.
然而，当利率是随机变量时，目前的研究成果并不多见。
However, when the interest rate being stochastic, these are not more.
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