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.
50+2是什么意思,为什么+2?