Essential Question: How can you place values to represent data graphically?
1 Activity: Making a Data Display
The list below gives the ages of these women when they became first ladies of the United States:
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Question 1
1.
1a. The incomplete data display shows the ages of the first ladies in the left column of the list above.
What do the numbers to the left of the line represent? What do the numbers to the right of the line represent?
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Question 2
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1b. This data display is called a stem-and-leaf plot. What numbers do you think represent the stems? leaves? Explain your reasoning.
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Question 3
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1c. Complete the stem-and-leaf plot from a and b using the remaining ages in the right column. Order the numbers to the right of the line in numerical order.
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Question 4
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1d. Find the median ages of the first ladies of the United States.
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Question 5
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1e. Write another question about the ages of first ladies that would be easier to answer using a stem-and-leaf plot than a dot plot.
2 Activity: Making a Back-to-Back Stem-and-Leaf Plot
The table below shows the ages of presidents of the United States from 1885 to 2009 on their first inauguration day.
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Question 6
6.
2a. On your stem-and-leaf plot from Activity 1(c), draw a vertical line to the left of the display. Represent the ages of the presidents by including numbers to the left of the line.
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Question 7
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2b. Find the median ages of the presidents of the United States.