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An age structure graph, also called a population pyramid, is a graphic description of the age and sex group distribution in a country's population. Please see the link for details.
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Demographic factors mean Socioeconomic characteristics of a population expressed statistically, such as age, sex, education level,income level, marital status, occupation, religion, birth rate, death rate, average size of a family, average age at marriage. A census is a collection of the demographic factors associated with every member of a population.
This refers to the arrangement or spread of people within certain given areas; it can alsoa pply to how the population of an area automatically tends to group based on factors such as age, race, or sex.
A standard or "average" IQ for anyone, regardless of age or sex falls in a range of 90-109 with 100 being solidly average. 50% of the population have scores somewhere in this average range.