How many Polish people, both Jews and non-Jews died in World War II?
In total, 6,123,000 Polish people died in World War II, 17.2% of the prewar population. This includes 123,000 military deaths and 6 million civilian deaths (including Jews). So, your student was off by 377,000 people. Sources: http://www.historyplace.com/worldwar2/timeline/statistics.