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Population density is determined by two things: the total population in a given are being studied and the size of that given area. We just do a little math with the numbers to obtain an answer. We generally talk about population density for, say, people, in terms of number of inhabitants per square mile, but certainly there are other measures that can be used. Spiders might be studied based on estimates of the number of them per acre. (Yes, really.) The math is simple. Figure out what units the area will be expressed in, such as square miles, acres, etc., and then take the population over the total area being studies and "reduce" the fraction to obtain an answer. If we have estimates of 50,000 people living across 10 square miles, then we'd compute that there was a population density of 5,000 people per square mile.

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17y ago

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