紫同学2018-10-04 15:33:41
10. An exchange rate has a given expected future value and standard deviation. A. Assuming that the exchange rate is normally distributed, what are the probabilities that the exchange rate will be at least 2 or 3 standard deviations away from its mean? 老师,这道课后题,看答案,没看懂,麻烦讲解一下计算过程。
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张玮杰2018-10-08 15:38:38
同学你好,这题的第一问,查表,2和3就是关键值,找到Z表对应的数字,2对应0.9772,单边尾巴剩下的区间就是0.0228,两边尾巴一起就是0.0456,同理3倍标准差
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