问一道题：NO.PZ2015120604000178 [ CFA I ]

问题如下：

BIM is a well-developed public company and its market capitalization growth rates over past few decades are normally distributed.The population has a mean of 10% and a standard deviation of 5.4%. An investor wants to figure out the probability that BIM's average capitalization growth rate will over 12.32% in the next three years (all the data are monthly statistics).Which of the following option is most accurate?

选项：

0.5%.

1%.

5%.

解释：

A is correct.

It is appropriate to use the central limit theroy to calculate.

$Standatd error = \frac{5.4 %/ \sqrt}{\sqrt{6}} = 0.009$

P(X＞12.32%)=P(Z＞ (12.32%-10%)/0.009)=P(Z＞2.58). So the corresponding probability is 0.5%.

z算出来等于2.578呀，也不大于2。58呀

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1 个答案

星星_品职助教 · 2020年09月06日

同学你好，

Z就是(12.32%-10%)/0.009=2.578，也就是2.58，这道题求的是Z＞这个数字也就是2.58的概率，根据上课要求背过的值，可知这个数字直接就是0.5%。

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问一道题：NO.PZ2015120604000178 [ CFA I ]

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