PHP:Accumulate over a File with Multiple Variables

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In these examples we accumulate more than one value. We still only need one loop - we just do more work in each.

Average population


Calculate the average population size for the countries of the world.

Print the total population by the number of countries.

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Is 3 million the median?


Show the number of countries with a population more than 3000000

Show the number of countries with a population less than 3000000

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USA and the world


Show the GDP of "United States" as a percentage of the world GDP.

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