NO.PZ2015120604000045
问题如下:
The table below shows the monthly stock returns of Ivy Corp.
According to the above table, calculate the median stock return for Ivy Corp.?
选项:
A.7.7%.
B.8.0%.
C.12.0%.
解释:
B is correct
Firstly, we rank the returns : 20% 12% 12% 4% 3% -5%.
As there are 6 observations, the median is the average of 12% and 4%
(12%+4%)/2=8%.
求median,数据个数是偶数,不应该=n+2 / 2=4 ?