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