about 6,894,000,000 (2011)
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The question is underspecified.What is the percentage required relative to:Roman Catholics in the world?Total population of Rome?Christian population of Rome?
Population Density = Total Population Divided By Total Area.In a simpler way, population over area
North America has about 7% the world's population and accounts for 1/3 of the world's economic output.
You take the total number of deaths and divide it by the total population, then times that by 100 and you will get the total death rate.
Population is total number of people who live in a geographical area