The following wars or armed conflicts are the most deadly in known human history. For each event see if you can guess the estimated geometric mean for deaths for each event.
These deaths are due to war not war crimes, genocide, religious persecution, ethnic cleansing, massacres, or other atrocities,
Source: Pinto, Carla M. A.; Lopes, A. Mendes; Machado, J. A. Tenreiro (2014). Ferreira, Nuno Miguel Fonseca; Machado, José António Tenreiro (eds.). Casualties Distribution in Human and Natural Hazards. Mathematical Methods in Engineering. Springer Netherlands. pp. 173–180.