(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\table[[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 =(b) If P=f(t) with t in years, estimate f'(2016) and give units.Use a left-hand interval and round your answer to three decimal places.f'(2016)=i