f1734adb_Dr__Arsham_s_Statistics_Site__The_Mode
[Fact No.] 5 [The Median] It cannot be manipulated algebraically: medians of subgroups cannot be weighted and combined. [The Mean] Means may be manipulated algebraically: means of subgroups may be combined when properly weighted. [The Mode] 
The mode does nott reflect the degree of modality.
Dr. Arsham's Statistics Site
The Mode