Variance of a population
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Khan AcademySal Khan
Variance of a population
Population variance is a measure of how spread out a group of data points is. Specifically, it quantifies the average squared deviation from the mean. So, if all data points are very close to the mean, the variance will be small; if data points are spread out over a wide range, the variance will be larger.
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Europe's population is projected to decline by about 6% to 7% by 2100, falling from around 450 million to 420 million, primarily due to an aging population and low fertility rates. While some countries like Ukraine and Latvia face significant population drops, others, particularly in Western and Northern Europe, are expected to see modest growth due to higher birth rates and migration. source : visualcapitalist.com #europe #map #educational
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