Displaying Data10-2

Warm UpWarm Up

Lesson PresentationLesson Presentation

Problem of the DayProblem of the Day

Lesson QuizzesLesson Quizzes

Displaying Data10-2

Warm UpWrite each fraction as a decimal.

1. 2.

3. 4.

0.4

0.06 0.7

0.9825

4950

350

710

Displaying Data10-2

Problem of the Day

Your job at the local library is to shelve the returned books. To correctly put the books on the shelves, you need to arrange them in order according to their numbers. Which order is correct? C

A. 342.3, 342.5, 342.48, 342.52

B. 342.21, 342.47, 342.4, 342.59

C. 342.1, 342.17, 342.56, 342.76

D. 342.34, 342.43, 342.567, 342.56

Displaying Data10-2

Prep for MA.8.S.3.1 …Construct appropriate data displays…to convey information and make conjectures about possible relationships.Review MA.7.S.6.2

Sunshine State Standards

Displaying Data10-2

Vocabulary

double-bar graph

frequency table

histogram

double-line graph

Displaying Data10-2

A double-bar graph is used to display and compare two sets of data. You can organize data using a frequency table by listing items according to the number of times the items occur.

Displaying Data10-2

Additional Example 1: Displaying Data in a Double-Bar Graph

Make a double-bar graph.

The following are the number of books read in one month by some boys and girls in Grade 8.

Books read 0 1 2 3 4 5

Boys 2 3 3 1 0 1

Girls 2 1 2 4 1 0

Displaying Data10-2

Additional Example 1 Continued

Make a double-bar graph.

0

1

2

3

4

0 1 2 3 4 5

Boys

Girls

Freq

uen

cy

Books read

The frequencies are the heights of the bars in the graph. Use a different color to represent each gender.

Displaying Data10-2

Check It Out: Example 1

Make a double-bar graph.

The following are the number of tickets sold in one week by the boys and girls in Grade 8.

Tickets Sold 0 5 10 15 20 25

Boys 3 9 3 8 5 2

Girls 4 4 9 8 3 6

Displaying Data10-2

Check It Out: Example 1 Continued

Make a double-bar graph.

0

1

2

3

4

5

6

7

8

9

0 5 10 15 20 25

Boys

Girls

Freq

uen

cy

Tickets Sold

The frequencies are the heights of the bars in the graph. Use a different color to represent each gender.

Displaying Data10-2

A histogram is a bar graph that shows the frequency of data within equal intervals.

Displaying Data10-2

Additional Example 2: Displaying Data in a Histogram

Jimmy surveyed 12 children to find out how much money they received from the tooth fairy. Use the data to make a histogram.

$0.35 $2.00 $0.75 $2.50 $1.50 $3.00

$0.25 $1.00 $1.00 $3.50 $0.50 $3.00

First, make a frequency table with intervals of $1.00. Then make a histogram.

Displaying Data10-2

Additional Example 2 Continued

$0.35 $2.00 $0.75 $2.50 $1.50 $3.00

$0.25 $1.00 $1.00 $3.50 $0.50 $3.00

33.00–3.99

22.00–2.99

31.00–1.99

40–0.99

FrequencyMoney ($)

Displaying Data10-2

Additional Example 2 Continued

Histograms do not have spaces between the bars.

Helpful Hint

Fre

qu

en

cy

Displaying Data10-2

Check It Out: Example 2

Tonya surveyed 14 children at an after school day care to find out how many hours they spend there. Use the data to make a Histogram.

2:00 1:40 3:00 0:30 1:00 1:30 2:30

0:30 2:45 1:00 2:00 1:35 1:30 3:00

First, make a frequency table with intervals of 30 minutes. Then make a histogram.

Displaying Data10-2

Time Spent at Day Care

Frequency

0:00 to 0:30 2

0:31 to 1:00 2

1:01 to 1:30 2

1:31 to 2:00 4

2:01 to 2:30 1

2:31 to 3:00 3

2:00 1:40 3:00 0:30 1:00 1:30 2:30

0:30 2:45 1:00 2:00 1:35 1:30 3:00

Check It Out: Example 2 Continued

Displaying Data10-2

Check It Out: Example 2 ContinuedFr

equ

ency

Hours Spent at Day Care

0

1

2

3

4

5

0:00 to0:30

0:31 to1:00

1:01 to1:30

1:31 to2:00

2:01 to2:30

2:31 to3:00

Displaying Data10-2

A double-line graph is used to show how two related sets of data change over time.

Displaying Data10-2

Additional Example 3: Displaying Data in a Double-Line Graph

Make a double-line graph of the given data. Use the graph to estimate the number of CDs and DVDs sold in 2007.

The Music Shop CD and DVD SalesYear CD’s Sold DVDs Sold

2002 3002 735

2004 3098 1057

2006 4685 3010

2008 5804 4047

Displaying Data10-2

Additional Example 3 Continued

Plot the data.

The graph shows about 5250 CDs and 3500 DVDs were sold in 2007.

0

1000

2000

3000

4000

5000

6000

7000

2002 2004 2006 2008

CD

DVD

The Music Shop CD and DVD SalesN

um

ber

Sold

Year

Displaying Data10-2

Check It Out: Example 3

Make a double-line graph of the given data. Use the graph to estimate the number of strawberries and figs grown in 2004.

Perry's Strawberry-Fig Farm Sales

Year Strawberry Baskets Sold Figs Sold

2001 4,000 1,200

2003 4,500 2,000

2005 8,000 3,500

2007 5,500 3,200

Displaying Data10-2

Check It Out: Example 3 Continued

Plot the data.

The graph shows about 6250 strawberry baskets and 2800 figs were sold in 2004.

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

2001 2001 2005 2007

StrawberryBaskets

Figs

Perry’s Strawberry-Fig Farm Sales N

um

ber

Sold

Year

Displaying Data10-2

Standard Lesson Quiz

Lesson Quizzes

Lesson Quiz for Student Response Systems

Displaying Data10-2

Lesson Quiz: Part I

1. Make a double-bar graph.

Displaying Data10-2

Lesson Quiz: Part II

2. Make a histogram with intervals of 5 using the

following data set: 7, 12, 8, 4, 4, 3, 6, 1, 14, 19, 8,

9

Units Frequency

0-4 4

5-9 5

10-14 2

15-19 1

Displaying Data10-2

Lesson Quiz: Part III

3. Estimate the temperature on January 6 in 2004

and 2005 using the graph below.

2005: 31 °F, 2004: 30 °F

Displaying Data10-2

1. Estimate the rainfall on December 8 in 2003 and 2005 using the graph below.

A. 2003: 3.5 in.; 2005: 2 in.

B. 2003: 2 in.; 2005: 3.5 in.

C. 2003: 3.5 in.; 2005: 3.5 in.

D. 2004: 2 in.; 2005: 2 in.

Lesson Quiz for Student Response Systems

Displaying Data10-2

2. Use the graph to identify the days on which toy trucks were sold more than toy trains.

A. Mon, Fri

B. Tues, Weds, Thurs

C. Mon, Thurs

D. Tues, Weds, Fri

Lesson Quiz for Student Response Systems