Marvin was doing a study comparing the population growth of his hometown in the early twentieth century with its population growth in the early 1980s. When he came across the two graphs shown here, Marvin noticed that the first graph appeared to be steeper than the second. He concluded that the population was growing faster at the beginning of the century than it was in the early 1980s. Population (in thousands) 78- 77 76- 75- 1900 1904 1908 1912 Year Population (in thousands) 90 88 86 1980 1981 1982 1983 Year 1. Use the first graph to calculate the average increase in population per year for the interval from 1900 to 1912.

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