1. EXAMPLE 1 Making a Stem-and-Leaf Plot 28.6 29.2 28.1 27.5 29.8 28.7 30.2 29.3 28.3 28.9 29.9 28.4 How can the data be displayed to show the distribution of the times? Hurdlers entering the 200 meter hurdles at a track meet were ranked according to their qualifying times, in seconds, shown below. Track

2. EXAMPLE 1 Making a Stem-and-Leaf Plot STEP 1 the stems. The times range from 27.5 seconds to 30.2 seconds. Let the stems be the digits in the tens’ and ones’ places. Then the leaves are the tenths’ digits. Identify Write the stems first. Then record each time by writing its tenths’ digit on the same line as its corresponding stem. Include a key that shows what the stems and leaves represent. STEP 2 STEP 3 Make an ordered stem-and-leaf plot.

3. EXAMPLE 1 Making a Stem-and-Leaf Plot Ordered Plot 27 5 28 1 3 4 6 7 9 29 2 3 8 9 30 2 Key : 27 5 = 27.5 Unordered Plot 27 5 28 6 1 7 3 9 4 29 2 8 3 9 30 2 Key : 27 5 = 27.5

4. GUIDED PRACTICE for Example 1 1. Make an ordered stem-and-leaf plot of the video game prices: $40, $15, $10, $19, $12, $24, $15, $39, $51, $50, $35, $20, $47, $36, $30, $25, $27, $29, $24, $43, $29. ANSWER