n=6怎么来的？

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.

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

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

n=6怎么来的？完全看不懂

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星星_品职助教 · 2021年02月07日

同学你好，

这道题的n应该是36，√n=6

题干中提示“... in the next three years (all the data are monthly statistics)”，也就是数据取的是未来三年，按照月度数据取，所以就是n=3×12=36

Standard error=5.4%/ √36=5.4%/ 6=0.009

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n=6怎么来的？

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