金沁汐 · 2023年04月23日
NO.PZ2015120604000097
问题如下：
A fund manager finds that the return of funds in the market are normally distributed having a mean of $160,000 and a standard deviation of $30,000. The percent of stock investors that have incomes greater than $100,000?
选项：
A.
34.13%.
B.
68.26%.
C.
97.72%.
解释：
C is correct.
Z=(100000 - 160000)/30000=F(-2).
1- F(-2) = F(2) = 0.9772.
需要差的表在哪里找呢
NO.PZ2015120604000097 问题如下 A funmanager fin ththe return of fun in the market are normally stributehaving a meof $160,000 ana stanrviation of $30,000. The percent of stoinvestors thhave incomes greater th$100,000? A.34.13%. B.68.26%. C.97.72%. C is correct.Z=(100000 - 160000)/30000=F(-2).1- F(-2) = F(2) = 0.9772. 讲义里面的正态分布表中最多到1.4几没有2阿？是我没找对表吗？
NO.PZ2015120604000097 问题如下 A funmanager fin ththe return of fun in the market are normally stributehaving a meof $160,000 ana stanrviation of $30,000. The percent of stoinvestors thhave incomes greater th$100,000? A.34.13%. B.68.26%. C.97.72%. C is correct.Z=(100000 - 160000)/30000=F(-2).1- F(-2) = F(2) = 0.9772. 請問如何判斷應該查甚麽表？教學短片内說考試不會考查表，
你好，关于F(-2)=1-2=-1, 查表格的时候不应该是0.8413吗？如果我的思路不对，可以麻烦老师详细一下第二步吗？
请问这个题没提供表，怎么算F（2.0）呢
