Chapter 6, Review Exercises, Question 043 With / in years since April 20th 2015, the population, P, of the world in billions can be modeled by P = 7.170-01064? www.indexmundi.com, accessed April 20, 2015. (a) What does this model give for the world population in 2021? In 2026? Round your answers to one decimal place. 2021 : billion people 2026 : billion people (b) Use the Fundamental Theorem to find the average population of the world between April 2015 and April 2021. Round your answer to one decimal place. Average population = billion people. the absolute tolerance is +/-0.1