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陈翠铭 · 2018年06月09日

问一道题:NO.PZ2017092702000094 [ CFA I ]

问题如下图:实在不知道答案用的是哪个算法里面的公式。请明示。谢谢!

选项:

A.

B.

C.

解释:

1 个答案
已采纳答案

源_品职助教 · 2018年06月09日

这是全概率公式求均值的运用。有N种可能,每种可能性下又有一个未来的值。那把这些值按照发生概率加权平均,就是语气的均值。当然这题是根据这一思路反求出发生的概率P

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NO.PZ2017092702000094 问题如下 A stois price$100.00 anfollows a one-periobinomiprocess with up move thequals 1.05 ana wn move thequals 0.97. If 1 million Bernoulli trials are concte anthe average terminstopriis $102.00, the probability of up move (p) is closest to: A.0.375. B.0.500. C.0.625. C is correct.The probability of up move (p) cfounsolving the equation: (p)uS + (1 – p) = (p)105 + (1 – p)97 = 102. Solving for p gives 8p = 5, so thp = 0.625.100到105是move up,概率为p;100到97是move wn,概率为1-p,这是一期二叉树的情况,此时这个一期二叉树的均值就是105×p+97×(1-p)。根据题干,这个均值为102105×p+97×(1-p)=102,可以直接解得p=0.625 没看答案是 我用的二项分布算的,E(X) =np算呢,p= 102/1million 。。。。没答案,,,然后就不知道知识点了这咋能看出来是二叉树呢,我记得课上讲的时候咋的还有个tree的单词。。。咋理解呀老师

2022-12-18 22:27 1 · 回答

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2022-09-09 21:49 1 · 回答

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2022-06-17 10:05 1 · 回答

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2022-03-26 13:23 1 · 回答

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2022-03-16 09:38 1 · 回答