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4. The table gives the population of the world in the 20th century. (8) Year Population (in millions) Year Population (in millions) 1900 1650 1960 3040 1910 1750 1970 3710 1920 1860 1980 4450 1930 2070 1990 5280 1910 2300 2000 6080 1950 2560 (a) Find the average rate of population growth between 1960 and 1970. (b) Find the average rate of population growth between 1950 and 1960. (c) Find the average rate of population growth between 1960 and 1980. (a) Estimate the rate of population growth in 1960 by averaging the slopes of two secant lines (using the years 1950 and 1960, then 1960 and 1970)