World populations are shown in Table 32 for various years.
Table 32
World Population
YearPopulation (billions)
1930 ……………………2.070
1940 ……………………2.295
1950 ……………………2.500
1960 ……………………3.050
1970 ……………………3.700
1980 ……………………4.454
1990 ……………………5.279
2000 ……………………6.080
2010 ……………………6.916
2015 ……………………7.248
Let y be the world’s population (in billions) at x years since 1930.
a. Construct a scatterplot.
b. Find an equation of a model.
c. Graph the model on the scatterp1ot. Verify that the model passes through the two points you chose in finding the equation in part (b) and that it comes close to all of the data points.
d. What is the coefficient a of the model  = abx? What does it mean in this situation?
e. Estimate the increase in world population from 2009 to 2013. Compare your result to the 2013 U.S. population of 317 million.