Stem-and-Leaf Plots

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Stem-and-Leaf Plots
Susan Phillips Lees Summit, MO
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Stem-and-Leaf Plot

• Uses place value to organize data
• Shows data in an organized way so it can be
  analyzed easily
• Organizes data so it is easier to find the
  median, mode, and range

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Here are the scores for a freshman basketball
team

• Here is the same data organized into a
  stem-and-leaf plot.

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Can you tell how the stem-and-leaf plot was made?
The first number in the data is 27.
Here is the 2 in the tens place.
Here is the 7 in the ones place.
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The key shows us which place value the digits
represent.
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The stems all represent tens place in this
stem-and-leaf plot.
The leaves all represent ones.
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Lets try one together
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• Here are one students math test scores.
• Make a stem-and-leaf plot for this data.

First, draw the dividing lines.
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• Here are one students math test scores.
• Make a stem-and-leaf plot for this data.

Stems Leaves
Next, label the stem side and the leaf side.
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• Here are one students math test scores.
• Make a stem-and-leaf plot for this data.

Stems Leaves
7 5
Find the smallest piece of data and plot it on
the grid.
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• Here are one students math test scores.
• Make a stem-and-leaf plot for this data.

Stems Leaves
7 5
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Find the next smallest piece of data and plot it
on the grid.
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• Continue with this process until
• you have entered all the data.

Stems Leaves
7 5
9
8 3
4 6 6 8
9 1 4 9
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• Remember to add a title.

Test Scores
Stems Leaves
7 5
9
8 3
4 6 6 8
9 1 4 9
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• Dont forget the key!

Test Scores
Stems Leaves
7 5
9
8 3
4 6 6 8
9 1 4 9
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You just completed a stem-and-leaf plot!
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Now, try it on your own
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• This table shows the times in seconds and
  hundredths of seconds for the womens 500-meter
  speed-skating competition in the 2002 Winter
  Olympics.

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Use this data to make a stem-and-leaf plot.
2002 Winter Olympics 500-Meter Speed-Skating
Times in Seconds
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Check your work
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Using Stem-and-Leaf Plots

• What was the least number of cookies sold?

40 boxes
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Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220

• What was the largest number of cookies sold?

94 boxes
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Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220

• Find the median of the data
• Find the middle leaf
• 63 boxes

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Using Stem-and-Leaf Plots
Boxes of Girl Scout Cookies Sold by Troop 220

• Find the mode of the data
• Look for the number that occurs
  most often in a row of
  leaves
• 63 boxes

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Stem-and-Leaf Plots

• The
• End