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Even if the expected value is the same, they'd move around a lot.
即使股票的价格是一样的，但是它们的价格经历很多改变。
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Another important concept in probability theory that we will use a lot is expected value, the mean, or average-- those are all roughly interchangeable concepts.
概率论中另外一个常用的重要的概念是,期望值或者也叫均值,这两个概念可以互换
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Expected value is good and variance is bad because that's risk; that's uncertainty.
期望值越高越好,方差就相反,因为方差代表着风险,也就是不确定性
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We want a high expected value of returns, but we don't like variance.
我们希望收益的期望值较高,并且稳定
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Since this is a concave function, it's not just the expected value.
由于这是一条凹曲线,它不只是期待值
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We have expected value, mean or average.
我们可以用期望值,或者是平均值
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That's called the expected value.
这个加权平均值就是期望值
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The basic definition-- the expected value of some random variable x--E--I guess I should have said that a random variable is a quantity that takes on value.
最基本的定义,某一个随机变量X的期望值E,我应该提到过,随机变量是一个可以取值的数
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