Chapter 8.9, Problem 4WE

To determine

To find: the approximate population.

Answer to Problem 4WE

The approximate population is $217$ millions in year $1976$ .

Explanation of Solution

Given information:

The year is $1976$ .

Calculation: let population is $x$ ,

Year	Population
$1970$	$203$
$1976$	$x$
$1980$	$227$

Now, the difference,

  $\begin{array}{l}\frac{d}{24}=\frac{6}{10}\\ \frac{d}{24}=.6\text{ [divide]}\\ d\approx 14\text{ [multiply]}\end{array}$

Now, to find the value of population,

  $\begin{array}{l}x=203+d\\ x=203+14\text{ [substitute]}\\ x=217\text{ [add]}\end{array}$

Thus, The value of population is $217$ millions.