In which of these countries has the lowest population density?
Canada
Saudi Arabia
Russia
Australia 
About 19,731,984 people live in Australia on an area of 7,686,550, which gives 2.6 people per km². Next is Canada 3.3, Russia 8.5 and Saudi Arabia 12 people.
reach: rather globalcountry recordspeoplepopulation
Answers by country
Canada
Saudi Arabia
Russia
Australia 
answers
 Greece
Greece19
 Australia
Australia14
 Republic of Ireland
Republic of Ireland10
 the United States
the United States55
 France
France10
 Germany
Germany161
 the United Kingdom
the United Kingdom48
 Poland
Poland4000
 Switzerland
Switzerland13
 the Netherlands
the Netherlands10
 Austria
Austria35
 India
India16