How is density of population usually measured?

Persons per sq. km.

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The number of people in a country.

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The number of house holds in a country.

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The number of births from one census to the next in a country

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Solution

The correct option is C Persons per sq. km.
The population density is the ratio between the land area and the people living over it. It is the number of people per unit of area, usually quoted ‘population per square kilometer’. According to census 2011, India's population density is 382 per square kilometer.

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Country	Total Population	Population Density
A	6,500,000 people	600 people per square mile
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