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 26th number. Interval between 13%-18% exits median and the frequency is 6.
为什么是数值加和除2?而不是0、1、2、3、4、6、7,media直接就是3了?