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kevinzhu · 2019年11月08日

问一道题:NO.PZ2015120604000108

问题如下:

If a Portfolio's SFR is 1.4 and  threshold level's return is  supposed to be 2%, what is the probability of return less than 2%?

选项:

A.

8.08%.

B.

30.20%.

C.

9.68%.

解释:

A is correct.

Using the table, we get F( -1.4) is 1 - 0.9192 = 8.08%.

等价于求Z<[ RL-E(Rp) ]/ σp,为啥不是Z<[ E(Rp)- RL]/ σp即Z<1.4?

1 个答案

星星_品职助教 · 2019年11月09日

同学你好,

回忆一下正态分布标准化的过程哈,Z=(X-μ)/σp。所以是减去均值,不能用均值去减X。

同理到这道题,E(Rp)是均值的概念,所以需要被减去。这样才是标准化的公式。

这道题很绕,可以多看几遍,或者隔段时间再回来复习一下,加油。

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