leozhenlin · 2020年09月28日
问题如下：
A fund manager finds that the return of funds in the market are normally distributed having a mean of $170,000 and a standard deviation of $25,000. The percent of stock incomes greater than $245,000 is closest to:
选项：
A.0.50%.
B.2.28%.
C.0.13%.
解释：
C is correct.
Z=(245000 - 170000)/25000=F(3)
1 - F(3) = 1 - 0.9987 = 0.0013.
完全不知道为什么这么算了，不是已经是正态分布了么，怎么还需要转换？F（3）代表什么？
NO.PZ2015120604000096 问题如下 A funmanager fin ththe return of fun in the market are normally stributehaving a meof $170,000 ana stanrviation of $25,000. The percent of sto incomes greater th$245,000 is closest to: A.0.50%. B.2.28%. C.0.13%. C is correct.Z=(245000 - 170000)/25000=F(3)1 - F(3) = 1 - 0.9987 = 0.0013. 这题没给F3 考试一般都会有的吧，除了4个特殊值
NO.PZ2015120604000096 2.28%. 0.13%. C is correct. Z=(245000 - 170000)/25000=F(3) 1 - F(3) = 1 - 0.9987 = 0.0013.什么时候要用标准化来做题呢 比如z和t检验。看到哪个信号能知道用标准化检验呢
NO.PZ2015120604000096 老师能给一下完整版的查询表吗？thx
2.28%. 0.13%. C is correct. Z=(245000 - 170000)/25000=F(3) 1 - F(3) = 1 - 0.9987 = 0.0013.为什么1.65，1.96，2.58这些数可以用作是Z带入算题目呢？这些数不是代表落在这些数的倍数的标准差内吗？
