7th Grade Math

Chapter Study Guide and Review

548 Statistical Displays

Statistical Displays

Circle Graphs (Lesson 3B)

18. COLORS The Shade Percent
    Navy 35%
    Sky/light blue 30%
    Aquamarine 17%
    Other 18%

table shows the

shades of blue

paint sold.

Display the

data in a

circle graph.

EXAMPLE 4 Which pizza was chosen by

about twice as many people as supreme?

Pepperoni



1FQQFSPOJ



$IFFTF



4VQSFNF



7FHFUBCMF

Types of Pizza

was chosen

by about

twice as

many people

as supreme.

Histograms (Lesson 3C)

Use the histogram at the right.

19. How large is each interval?


20. What percent of the runners ran
    75 seconds or slower?


21. What was the most likely time?


22. What was the greatest time?


23. PLANTS The heights in inches of various
    types of plants are listed below. Choose
    intervals and construct a histogram to
    represent the data.
    1, 1, 2, 4, 4, 5, 6, 7, 7, 8, 9, 10, 11, 12, 12,
    12, 13, 14, 17, 18, 18, 19, 21, 23, 24

EXAMPLE 5 Choose intervals and

construct a histogram to represent the

following 400-meter dash times.

61 71 68 68 69 72 73 61 76 70

64 64 63 82 68 78 74 80 62 75

400-Meter Dash

Frequency

60–

64

65–

69

70–

74

75–

79

80–

84

Time (seconds)

0

2

4

6

8

Stem-and-Leaf Plots (Lesson 3E)

Display each set of data using a stem-and-

leaf plot.

24. hours worked: 29, 54, 31, 26, 38, 46, 23,
    21, 32, 37


25. number of points: 75, 83, 78, 85, 87, 92,
    78, 53, 87, 89, 91


26. birth dates: 9, 5, 12, 21, 18, 7, 16, 24, 11,
    10, 3, 14

EXAMPLE 6 Display the number of pages

read in a stem-and-leaf plot: 12, 15, 17, 20,

22, 22, 23, 25, 27, and 35.

The tens digits form Pages Read

Stem Leaf

1

2

3

2 5 7

0 2 2 3 5 7

5

2 | 3 = 23 pages

the stems, and the

ones digits form

the leaves.

Lesson 3

546_550_C09_SGR_895130.indd 548 1/11/10 9:47 AM