Page 545 - Basic College Mathematics with Early Integers

522 C HAPTE R 7 I STATISTICS AND PROBABILITY

Since a circle graph represents a whole, the percents should add to 100% or 1.
Notice this is true for Example 2.

PRACTICE 3 Example 3 Finding Percent of Population
Use the information in
Example 3 and the circle graph The U.S. Department of Commerce forecasts 61 million international visitors to
from Example 2 to estimate the the United States in 2011. Use the circle graph from Example 2 and estimate the
number of tourists from number of tourists that might be from Europe.
Mexico in 2011. Solution: We use the percent equation.

#
amount = percent base
#
amount = 0.253 61,000,000
= 0.253(61,000,000)
= 15,433,000

Thus, 15,433,000 tourists might come from Europe in 2011.

Work Practice 3

Concept Check Can the following data be represented by a circle graph?
Why or why not?

Responses to the Question, “In
Which Activities Are You Involved?”
Intramural sports 60%

On-campus job 42%
Fraternity/sorority 27%
Academic clubs 21%

Music programs 14%

Objective Drawing Circle Graphs

To draw a circle graph, we use the fact that a whole circle
contains 360° (degrees).
360

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Answer
3. 7,503,000 tourists from Mexico

Concept Check Answer
no; the percents add up to more than
100%