# File

```NAME ________________________________________ DATE _____________ PERIOD _____
Reteach
Histograms
Data from a frequency table can be displayed as a histogram, a type of bar graph used to display
numerical data that have been organized into equal intervals. These intervals show the frequency
distribution of the data, or how many pieces of data are in each interval.
Example
10
8
6
4
41
–5
0
9
9
–5
–4
50
restaurant. Choose intervals, make a frequency
table, and construct a histogram to represent
the data.
2
0
9
SODA The table shows the daily soda sales for a
Ages of Teachers
10
8
6
4
–3
Exercise
1
40
For each interval, draw a bar whose height
is given by the frequencies.
50–59
6
30
Step 3
40–49
9
Show the intervals from the frequency table
on the horizontal axis. Label the vertical
axis to show the frequencies.
9
⁄ ||||
||||
⁄ |
||||
|
–2
Step 2
30–39
20
Draw and label a horizontal and vertical
axis. Include a title.
Age (yr)
Number of Sodas Sold Daily
56
86
74
63
51
94
86
72
53
77
74
88
81
90
72
76
84
92
78
89
85
75
91
87
Course 1 • Analyze Data and Graphs
Step 1
Ages of Teachers
Age (yr) Tally Frequency
4
20–29
||||
Number of Teachers
teachers at a middle school. Draw a
histogram to represent the data.
31
–4
0
Weight (lb)
Example
TEACHERS The table shows the ages of
21
–3
0
11
–2
0
2
0
1–
10
dogs in the class weigh more than 20 pounds?
Seven dogs weigh between 21 and 30 pounds, three
dogs weigh between 31 and 40 pounds, and one dog
weighs between 41 and 50 pounds. So, there are
7 + 3 + 1, or 11 dogs in the class that weight more
than 20 pounds.
Number of Dogs
DOGS Refer to the histogram shown. How many
Weights of Dogs in
Obedience Class
```