NO.PZ2015120604000096
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.
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