(Modeling) Mobility of the U.S. Population The U.S. population, in million...

(Modeling) Mobility of the U.S. Population The U.S. population, in millions, is given in the table. The figures are for the midyear of each decade from the 1960s through the 2000s. If we let the midyear shown in the table represent each decade, we can use the population figures of people moving with the data given in the graph.

(a) Find the number of Americans, to the nearest tenth of a million, moving in each year given in the table.

(b) The percents given in the graph decrease each decade, while the populations given in the table increase each decade. From your answers to part (a), is the number of Americans moving each decade increasing or decreasing? Explain.