这题什么意思，我还以为z=(12.32%-10%)/5.4%,算出来0.664，然后1-0.664=0.34，然后我以为考贝努利分布呢36C36*0,34^36呢，完全没明白考什么
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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?
您的回答, 正确答案是: A
A
正确0.5%.
B
1%.
C
5%.
数据统计(全部)
做对次数: 1192
做错次数: 1152
正确率: 50.85%
数据统计(个人)
做对次数: 1
做错次数: 0
正确率: 100.00%
解析
A is correct.
It is appropriate to use the central limit theroy to calculate. Standard error=5.4%/\sqrt {\rm{36}}
36
P(X＞12.32%)=P(Z＞ (12.32%-10%)/0.009)=P(Z＞2.58). So the corresponding probability is 0.5%.
