Stem-and-Leaf Plots

1
Stem-and-Leaf Plots

• A stem-and-leaf plot can help you compare data.

Discovering Math Statistics and Data Analysis
(Grades 6-8). Discovery Channel School.
2006.unitedstreaming. 22 October
2007lthttp//streaming.discoveryeducation.com/gt
2
The heights of 11 fourth-grade badminton players
are (in inches)

• 56
• 61
• 61
• 60
• 59
• 57

• 58
• 58
• 63
• 61
• 59

3
You can organize this data in a stem-and-leaf
plot!
4
First, order your data from least to greatest.

• 56
• 57
• 58
• 58
• 59
• 59

• 60
• 61
• 61
• 61
• 63

5
Then, put your data in a stem-and-leaf plot.
6
The ordered numbers are 56, 57, 58, 58, 59, 59,
60, 61, 61, 61, 63

• Each STEM stands for the first digit of each
  number.
• Record the tens digits in order from least to
  greatest.

HEIGHT IN INCHES
Stem Leaves
5 6 6, 7, 8, 8, 9, 9 0, 1, 1, 1, 3
7
The ordered numbers are 56, 57, 58, 58, 59, 59,
60, 61, 61, 61, 63

• Each LEAF stands for the second digit of each
  number.
• Record the ones digits in order from least to
  greatest.

HEIGHT IN INCHES
Stem Leaves
5 6 6, 7, 8, 8, 9, 9 0, 1, 1, 1, 3
8
You can use a stem-and-leaf plot to find the
median and the mode.
9
HEIGHT IN INCHES
Stem Leaves
5 6 6, 7, 8, 8, 9, 9 0, 1, 1, 1, 3

• MEDIAN
• Find the middle number in a set of numbers.
• The median is 59 inches.

• MODE
• Find the number that occurs most often in a set
  of numbers.
• The mode is 61 inches.

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Now, lets try one on our own!
11
Here are the scores of our volleyball games in a
stem-and-leaf plot!
12
Volleyball Scores for Our Team
Stem Leaves
0 5, 6, 7, 9
1 3, 5, 5, 5, 6
13
How many volleyball games were played?
Stem Leaves
0 5, 6, 7, 9
1 3, 5, 5, 5, 6

• 9

14
What are the scores?
Stem Leaves
0 5, 6, 7, 9
1 3, 5, 5, 5, 6

• 5, 6, 7, 9, 13, 15, 15, 15, 16

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What is the median?
Stem Leaves
0 5, 6, 7, 9
1 3, 5, 5, 5, 6

• 13

16
What is the mode?
Stem Leaves
0 5, 6, 7, 9
1 3, 5, 5, 5, 6

• 15

17
Congratulations, you are on the way to being a
stem-and-leaf expert!!