第2步沒看懂，

NO.PZ2015120604000178

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. Standard error=5.4%/ $\sqrt {\rm{36}}$ P(X＞12.32%)=P(Z＞ (12.32%-10%)/0.009)=P(Z＞2.58). So the corresponding probability is 0.5%.

請問答案中： P(Z＞ (12.32%-10%)/0.009)=P(Z＞2.58)，這部分用的甚麽公式和概念，爲何要有這步？謝謝。

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星星_品职助教 · 2022年04月27日

同学你好，

公式为正态分布标准化，这步的目的是为了查表。

题干要计算的P(X＞12.32%)是无法直接查表得出答案的，只有将其标准化变成P(Z＞2.58)后，才可以通过查标准正态分布表（z表）得出结果。

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第2步沒看懂，

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