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熊熊先生 · 2017年09月21日

没看懂答案问一道题:NO.PZ2015120604000178 [ CFA I ]

问题如下图:
选项:
A.
B.
C.
解释:
1 个答案

源_品职助教 · 2017年09月21日

第一步求出均值的标准误

第二步将P(X>15.5)标准化为P(Z>1.96)

第三部也不用查表了,单尾正太分布中1,96关键值尾部面积对应2.5%的概率

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