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And when we're talking about the amplitude of the wave, we're talking about the deviation from that average level. So, if we define the average level as zero, you can have either a positive amplitude or a negative amplitude.
当我们讨论一个波的振幅时,我们说的是偏离平均位置的量,如果我们把平均位置,定义为零的话，那幅值不是,正的就是负的，有时候人们在。
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So you cannot tell from the average everything that happened because another way to get the same 0 is to just not move at all.
所以说平均速度并不能提供所有的信息,因为完全静止所得出的结果也是0
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How many people here on average-- from the beginning of the semester until now get on average more than eight hours of sleep a night?
这里平均有多少人-,从开学到现在,平均每晚睡超过八小时的？
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There's no dropping of lowest scores from the average.
并没有去掉最低分的情况。
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So even if, on average, the stock is expected to not move at all from where it starts, some stocks will be expected to just trundle along without much change, not very volatile.
所以即使平均而言，股票应该是不会,和开盘的时候有什么区别，有一些股票可能会,没什么变化，不是很反复无常。
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Well, we might say, let's look at it from two basic perspectives, those who get less than the average lifespan and those who get more than the average lifespan.
我们可能会说，我们从两个基本角度来看，即那些活得比平均寿命短的,还有那些活得比平均寿命长的。
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I computed the returns on the stocks, bonds, and oil for every year from 1983 and I computed the average returns, which I take as the expected returns, I took the standard deviations, and I took the covariance.
我计算了从1983年以来每年的股票,债券和石油的收益，从而得出平均收益率，这些平均收益率作为预期收益率，然后算得标准差及协方差。
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I want to talk about - move on and talk a little bit about some general concepts from physiology that are really important and here is a table that gives characteristics of an average person.
接下来我想说一些,生理学上非常重要的基础性的概念,这里有一个表格,给出了一个普通人的特征参数
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Because of this policy, I don't actually know when all is said and done whether at the end of the semester I'm any harder, whether I depart from the average or not.
因为这个政策，我其实不知道当所有的说完,和做完是否在学期结束我评分更严格，是否我偏离了平均水平。
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That's how many steps your average person is away from Kevin Bacon.
这就是一般人离Kevin，Bacon的度数。
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