NO.PZ2018062016000043
问题如下:
From the picture, the frequency of return's median is:
选项:
A.7
B.4
C.6
解释:
C is correct. The sum of each frequency is 50. 50/2=25th,(50+2)/2=26th. So the median is the mean of the 25th and the 26th number which exsits between the interval of 13%-18%. The frequency of the selected interval is 6.
为啥25-26落在13-18的区间