Study Guide and Intervention (continued) - MathnMind

2-5
NAME ______________________________________________ DATE ____________ PERIOD _____
Study Guide and Intervention
Statistics: Displaying and Analyzing Data
Create Line Plots and Stem-and-Leaf Plots One way to display data graphically
is with a line plot. A line plot is a number line labeled with a scale that includes all the
data and s placed above a data point each time it occurs in the data list. The s represent
the frequency of the data. A stem-and-leaf plot can also be used to organize data. The
greatest common place value is called the stem, and the numbers in the next greatest place
value form the leaves.
Draw a line plot for
Use the data below to
the data.
create a stem-and-leaf plot.
3
6
3
4
4
3
7
9
9
1
10
2
2
4
3
2
62 74 89 102 92 65 68 98 78 65
78 80 83 93 87 89 104 109 104
Step 1 The value of the data ranges from 68 97 68 64 98 93 90 102 104
3 to 10, so construct a number line
containing those points.
The greatest common place value is tens, so
the digits in the tens place are the stems.
Thus 62 would have a stem of 6 and 104
321012345678 9 10 would have a stem of ten. The stem-and-leaf
Step 2 Then place an above the number
each time it occurs.
3 2 1 0 1 2 3 4 5 6 7 8 9 10
plot is shown below.
Stem | Leaf
Example 1 Example 2
6 | 2455888
7 | 488
8 | 03799
9 | 0233788
10 | 224449 6⏐2 62
Exercises
Use the table at the right for Exercises 1–3.
1. Make a line plot representing the weights of
the wrestlers shown in the table at the right.
100
110
120
130
140
150
2. How many wrestlers weigh over 140 lb?
3. What is the greatest weight?
Use each set of data to make a stem-and-leaf plot.
160
170
180
190
200
Weights of Junior Varsity Wrestlers (pounds)
170 160 135 135 160 122 188 154
108 135 140 122 103 190 154
4. 32 45 41 29 30 30 31 34 38 5. 102 104 99 109 108 112 115 120
36 32 34 41 40 42 41 29 30 112 114 98 94 96 101 100 102
© Glencoe/McGraw-Hill 99 Glencoe Algebra 1
Lesson 2-5