A Population Pyramid is a pair of histograms indicating the distribution of the population among the different age groups and sexes males on the left and females on the right.
The shape of a Population Pyramid can help understand growth patterns and possible dependency issues or gender imbalances. A pyramid with a wide base and narrow top suggests high fertility and a growing population , whereas a pyramid with a narrow base suggests an ageing population with low fertility rates.
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Compare pyramids over time from to based on United Nations Population projections. More on Population Pyramids. The age dependency ratio expresses the relationship between the "dependent population" ages and plus, referred as "youth" and "elderly" and the "working age population" ages Higher values indicate a greater level of dependency.
See also: definition and formula. A value below 2. See also: Countries in the world ranked by Life Expectancy. The population density in Sri Lanka is people per Km 2 people per mi 2 , calculated on a total land area of 62, Km2 24, sq. A Population pyramid also called "Age-Sex Pyramid" is a graphical representation of the age and sex of a population.
There are three types of age dependency ratio: Youth, Elderly, and Total. All three ratios are commonly multiplied by Youth Dependency Ratio Definition: population ages divided by the population ages Elderly dependency ratio Definition: population ages plus divided by the population ages Total dependency ratio Definition: sum of the youth and old-age ratios.
