The population of the United States has grown at different rates over ten-year increments as shown by the following table. Year Population of U.S. 1930 123.1 million 1940 132.1 million 1950 152.3 million 1960 180.7 million If the maximum supportable population of the U.S. is 600 million people, use the logistic model to predict the population (in millions of people) of the U.S. in 2015 by using the following years as data points. (Round your answers to one decimal place.) (a) using 1930 and 1940 as data points million people (b) using 1950 and 1960 as data points million people