Stem-and-Leaf Plots Susan Phillips Lee’s Summit, MO

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

Here are the scores for a freshman basketball team  Here is the same data organized into a stem-and-leaf plot.

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.

The key shows us which place value the digits represent.

The stems all represent tens place in this stem-and-leaf plot. The leaves all represent ones.

Let’s try one together…

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

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

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

Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Find the next smallest piece of data and plot it on the grid. Stems Leaves 7 59 The 7 for the tens place is already there. We just add the 9.

Continue with this process until you have entered all the data. Stems Leaves

Remember to add a title. Stems Leaves Test Scores

Don’t forget the key! Stems Leaves Test Scores Key: 7 5 means 75

You just completed a stem-and-leaf plot!

Now, try it on your own…

This table shows the times in seconds and hundredths of seconds for the women’s 500-meter speed-skating competition in the 2002 Winter Olympics.

Use this data to make a stem-and-leaf plot Winter Olympics 500-Meter Speed-Skating Times in Seconds

Check your work… 2002 Winter Olympics 500-Meter Speed-Skating Times in Seconds

Using Stem-and-Leaf Plots  What was the least number of cookies sold? Boxes of Girl Scout Cookies Sold by Troop boxes

Using Stem-and-Leaf Plots  What was the largest number of cookies sold? Boxes of Girl Scout Cookies Sold by Troop boxes

Using Stem-and-Leaf Plots  Find the median of the data Find the middle leaf… 63 boxes Boxes of Girl Scout Cookies Sold by Troop 220

Using Stem-and-Leaf Plots  Find the mode of the data Look for the number that occurs most often in a row of leaves 63 boxes Boxes of Girl Scout Cookies Sold by Troop 220

Stem-and-Leaf Plots The End