6th Grade Math Textbook, Fundamentals

Lesson 8-10 for exercise sets. Chapter 8 227

Practice & Activities

Two restaurants opened in the same year. The
graph shows the percent of tables filled at
dinnertime for each restaurant during its first
8 weeks of operation. Use the graph to answer
the questions.

1.What percent of Yum’s tables were

filled in its 4th week of operation?

2.In which week did the two restaurants

have the same percent of filled tables?

3.What is the approximate difference in

percent of filled tables for the two

restaurants in their 3rd week of operation?

4.Which restaurant do you predict will

have a greater percent of filled tables in

the 10th week of operation?

5.Discuss and Write Why is a multiple line graph an effective tool for

displaying and comparing sets of data in which changes occur over time?

You can make predictions about the trends you see in a line graph.

The graph below shows the number of health food stores in two cities.

Predict how many stores each city will have in 2012.

Number of Stores

Year

Health Food Stores

2000 2002 2004 2006 2008 2010 2012

25

20

15

10

5

0

Key:

Springfield

Greenvale

In Springfield, the trend seems to be an increase in the number of stores at

a rate of 2 or 3 stores every two years. In Greenvale, the trend appears to be

that the number of stores does not change significantly over time. So you can

predict that there will be about 25–30 health food stores in Springfield and

about 6–8 health food stores in Greenvale in 2012.

Percent (%)

Week

Percent of Tables Filled

12345678

80

70

60

50

40

30

20

10

0

Key:

Shrimpy’s Yum’s