(a) Using the table below, find the average rate of change in the world's population, P, between 2006 and 2020.¹ Give units. World population, in billions of people Year 2006 2008 2010 2012 2014 2016 2018 2020 Population 6.53 6.71 6.77 7.02 7.17 7.32 7.50 7.68 Round your answer to three decimal places. Rate of change of population = i (b) If P = f(t) with t in years, estimate f' (2008) and give units. Use a left-hand interval and round your answer to three decimal places.. f' (2008) = i

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