ving graph shows the population oi San Diego County Trom 1950 to 3000 2800 2500 2500 2000 1800 1500 1300 1000 1000 500 500 1940 1950 1960 1970 1980 1990 2000 2010 at annual (simple interest) rate r did the population of San Diego County increase from 1980 to 2000? (Round your answer to one decimal place.) % Population (1000)

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