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f=0 I would write f of x is in big Oh of n squared.
我写下了。
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So the normal--the bell-shaped curve in that case for the x/n is going to look something like this.
那么x/n的钟形曲线,大概就会是这个样子
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OK. And first of all, you say, wait a minute, x and n?
首先，你肯定会想，等等，x和n？首？
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When we have n observations it's just the summation i = 1 to n of 2/n.
当有n个观察值,这就是在i取1到n时,x减去x均值的平方,除以n的累加
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If n = 1, x/n can take on only two values: 0 or 1.
当n=1时,x/n的值只可能等于0和1
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It's much better--the uncertainty about x/n is much lower for the case n = 100 than it was for the case n = 1, but it's still there.
当n=100时,x/n的不确定性,比n=1时要小得多,但是不确定性仍然是存在的
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If you wrote only one policy, what's the probability distribution of x/n?
如果你只签了一份保单,那么x/n的概率分布是怎样的?
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The mean proportion-- The mean of x/n, is equal to p.
事件发生频率的均值,即x/n的均值,就等于p
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I'm plotting--this is the probability of various values of x/n.
这里是x/n等于各个值的概率
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What is the probability distribution for x/n in that case?
在这样的情况下,x/n的概率分布是怎样的
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Then, if n = 100--now I'm going to label this x differently, I'm now going to show the normal bell-shaped curve and I'm going to do this from 0 to .4.
如果n=100,现在我得重新标x值,我现在要画正态分布的钟形曲线了,在这儿用0到0.4
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