Chapter 14.1, Problem 58ES

a).

To determine

To find: Calculate and interpret ${\displaystyle \sum _{i=1}^5{a}_i}$ by using the numbers from the bar graph.

b).

To determine

To find: ${\displaystyle \sum _{i=1}^5{a}_i}$ by using the model $a_n=626n+2313,n=1,\mathrm{...},5$ shows that the number of Americans who gave up their U.S. citizenship $n$ year after 2012 or this underestimate or overestimate the value obtained.