Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Warm Up
Write the equivalent percent.
1.2. 3.
Find each value.
4. 20% of 360
5. 75% of 360
6.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
bar graph
line graph
circle graph
stem and leaf plot
frequency table
histogram
Vocabulary
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Bar graphs, line graphs, and circle graphs canbe used to present data in a visual way.
A bar graph displays data with vertical orhorizontal bars.
Bar graphs are a good way to display data thatcan be organized into categories.
Using a bar graph, you can quickly comparethe categories.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 1: Reading and Interpreting Bar Graphs
Use the graph to answer each question.
A. Which casserole wasordered the most?
B. About how many totalorders were placed?
C. About how many more tunanoodle casseroles wereordered than king ranchcasseroles?
D. About what percent of the total orders were forbaked ziti?
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
a. Which ingredient contains the least amount of fat?
bread
b. Which ingredients contain at least 8 grams of fat?
cheese and mayonnaise
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
A double-bar graph can be used to compare twodata sets. A double-bar graph has a key todistinguish between the two sets of data.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 2: Reading and Interpreting Double BarGraphs
A. Which feature receivedthe same satisfactionrating for each SUV?
Cargo
B. Which SUV received abetter rating for mileage?
SUV Y
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Check It Out! Example 2
Use the graph todetermine which yearshad the same averagebasketball attendance.What was the averageattendance for thoseyears?
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
A line graph displays data using line segments.Line graphs are a good way to display data thatchanges over a period of time.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
A. At what time was the humidity the lowest?
B. During which 4-hour time period did thehumidity increase the most?
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Check It Out! Example 3
Use the graph to estimate the difference intemperature between 4:00 A.M. and noon.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
A double-line graph can be used to compare howtwo related data sets change over time. A double-line graph has a key to distinguish between thetwo sets of data.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 4: Reading and Interpreting Double-LineGraphs
A. In which month didstation A charge morethan station B?
May
B. During which month(s) didthe stations charge the samefor gasoline?
April and July
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Check It Out! Example 4
Use the graph to describe the general trend ofthe data.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
A circle graph shows parts of a whole.
The entire circle represents 100% of the dataand each sector represents a percent of thetotal.
Circle graphs are good for comparing eachcategory of data to the whole set.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 5: Reading and Interpreting Circle Graphs
Which ingredients are present in equal amounts?
Lemon sherbet and pineapple juice.
12.5%
12.5%
25%
50%
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Check It Out! Example 5
Use the graph to determine what percent ofthe fruit salad is cantaloupe.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 6A: Choosing and Creating an AppropriateDisplay
Use the given data to make a graph. Explainwhy you chose that type of graph.
Flowers in anArrangement
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 6B: Choosing and Creating an AppropriateDisplay
Use the given data to make a graph. Explainwhy you choose that type of graph.
Degrees Held by Faculty
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 6C: Choosing and Creating an AppropriateDisplay
Use the given data to make a graph. Explainwhy you chose that type of graph.
County Farms
248
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 1A: Making a Stem-and-Leaf Plot
The numbers of defective widgets in batchesof 1000 are given below. Use the data tomake a stem-and-leaf plot.
14, 12, 8, 9, 13, 20, 15, 9, 21, 8, 13, 19
Number of Defective
Widgets per Batch
Stem Leaves
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 1B: Making a Stem-and-Leaf Plot
The season’s scores for the football teamsgoing to the state championship are givenbelow. Use the data to make a back-to-backstem-and-leaf plot.
Team A: 65, 42, 56, 49, 58, 42, 61, 55, 45, 72
Team B: 57, 60, 48, 49, 52, 61, 58, 37, 63, 48
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
The frequency of a data value is the number oftimes it occurs. A frequency table shows thefrequency of each data value. If the data isdivided into intervals, the table shows thefrequency of each interval.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 2: Making a Frequency Table
The numbers of students enrolled in WesternCivilization classes at a university are givenbelow. Use the data to make a frequency tablewith intervals.
12, 22, 18, 9, 25, 31, 28, 19, 22, 27, 32, 14
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 2 Continued
NumberEnrolled
Frequency
1 – 10
1
11 – 20
4
21 – 30
5
31 – 40
2
Enrollment in Western
Civilization Classes
Step 2 Divide the data into equal intervals.
For this data set, use aninterval of 10.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Check It Out! Example 2
The number of days of Maria’s last 15vacations are listed below. Use the data tomake a frequency table with intervals.
4, 8, 6, 7, 5, 4, 10, 6, 7, 14, 12, 8, 10, 15, 12
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
A histogram is a bar graph used to displaythe frequency of data divided into equalintervals. The bars must be of equal widthand should touch, but not overlap.
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Example 3: Making a Histogram
Use the frequency table in Example 2 tomake a histogram.
Step 1 Use the scale andinterval from the frequencytable.
Step 2 Draw a bar for thenumber of classes in eachinterval.
NumberEnrolled
Frequency
1 – 10
1
11 – 20
4
21 – 30
5
31 – 40
2
Enrollment in Western
Civilization Classes
Holt McDougal Algebra 1
10-1
Organizing and Displaying Data
Check It Out! Example 3
Make a histogram for the number of days ofMaria’s last 15 vacations.
4, 8, 6, 7, 5, 4, 10, 6, 7, 14, 12, 8, 10, 15, 12