1. Find the median of each set of data. 1. 5.8, 6.9, 7.4, 3.9, 6.4
Stem-and-Leaf Plots
LESSON 11-3
Problem of the Day
Find the median of each set of data.
, 6.9, 7.4, 3.9, 6.4
, 120, 130, 125
Solutions
3.9 5.8 6.4 6.9 7.4 ;
median: 6.4
2. 110 120 125 130
median: 2 =
245
122.5
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2. A double stem-and-leaf plot compares two sets of data in one diagram.
Stem-and-Leaf Plots
LESSON 11-3
Definition
A stem-and-leaf plot is a display that organizes your data by showing each item in order. The stem is the single digit on the left. The leaf is the remaining digit or digits after the vertical line.
A double stem-and-leaf plot compares two sets of data in one diagram.
Stem-and-leaf plots are like line plots.
A stem and leaf plot starts where reading a page of text starts: at the top left corner.
After this discuss reteaching example.
After this lesson you’ll find that stem-and-leaf plot helps you quickly find the median, mode and range.
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3. Stem-and-Leaf Plots How to make a stem and leaf plot
LESSON 11-3
How to make a stem and leaf plot
Smallest number at the top (Just like in a tree smallest stems are at the outer edge).
Arrange the leaves from least to greatest.
Key is very important.
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4. High Temperatures (°F)
Stem-and-Leaf Plots
LESSON 11-3
Additional Examples
Use the table below. Draw a stem-and-leaf plot of the data.
High Temperatures (°F)
Week
Week
key
Key: 6 | 1 means 61
High Temperatures
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5. Stem-and-Leaf Plots
LESSON 11-3
Additional Examples
Complete a stem-and-leaf plot for the following list of grades on a recent test:
73,  42,  67,  78,  99,  84,  91,  82,  86,  94
Now have them complete re-teaching worksheet questions, then have them do # 5- 8 of the practice worksheet.
Note this
Key – 4 | 2 means 42 points
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6. Monday has the longest wait time.
Stem-and-Leaf Plots
LESSON 11-3
Additional Examples
Quick Check
Compare the two sets of data in the stem-and-leaf plot.
Waiting for the Doctor
Monday Friday
Key: 1 min min
Make them do ex 2 on p. 545
Find the
greatest value.
Monday has the longest wait time.
Stem
a.  Which day had the longest
wait time?
b. How long was the longest wait?
The longest wait was 49 minutes.
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7. Does the data above support this statement?
Stem-and-Leaf Plots
LESSON 11-3
Additional Examples
Does the data above support this statement?
The average wait time for the doctor is about 24 minutes.
The wait times for the doctor are: 1, 2, 5, 6, 10, 11, 11, 14, 21, 23, 24,
26, 26, 26, 33, 35, 35, 47, 48, 48, 49.
The total of the wait times are 501 minutes.
501 total waiting time
21 wait times
24 minutes
Yes. The average wait time is about 24 minutes.
How can this data be misleading?
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8. Stem-and-Leaf Plots
LESSON 11-3
Additional Examples – See ex 2 on p. 545 of the book
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9. Scores of winning teams in the 15 Super bowls
Stem-and-Leaf Plots
LESSON 11-3
Lesson Quiz
Make a stem-and-leaf plot for this set of data.
points scored by winning teams in the first fifteen Super Bowls:
Scores of winning teams in the 15 Super bowls
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10. Stem-and-Leaf Plots
LESSON 11-3
Homework
Lesson 1-3, pp : #s 6, 8-15 all, 17
Quiz (11.1 thru 11.3) on Friday
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