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alex · 2021年04月24日

No.PZ2017092702000094 (选择题)

NO.PZ2017092702000094

问题如下:

A stock is priced at $100.00 and follows a one-period binomial process with an up move that equals 1.05 and a down move that equals 0.97. If 1 million Bernoulli trials are conducted, and the average terminal stock price is $102.00, the probability of an up move (p) is closest to:

选项:

A.

0.375.

B.

0.500.

C.

0.625.

解释:

C is correct.

The probability of an up move (p) can be found by solving the equation: (p)uS + (1 – p)dS = (p)105 + (1 – p)97 = 102. Solving for p gives 8p = 5, so that p = 0.625.

老师你好, 我用2叉树来解这道题

100到105move up p,105到102move down(1-p)

100到97move down(1-p),97到102 move up p

所以列公式的时候为什么不是 105(1-p)+97p=102 呢?

1 个答案

星星_品职助教 · 2021年04月24日

同学你好,

这道题提问重复了,复制回复如下:

------------------------

100到105是move up,概率为p;100到97是move down,概率为1-p

这是一期二叉树的情况,没有其他的二叉树延伸了。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102。

所以,102不是105和97进一步二期二叉树后的结果,而是这两者的均值。二叉树只有之前的一期。

所以根据105×p+97×(1-p)=102,可以直接解得p=0.625

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