Stem and Leaf Plots
Pre-Algebra Section 12.1
Data are like socks…
vs.
(Which would you rather use at when you’re getting ready to leave at 6:53 am?)
Stem and Leaf Plots Organize Data

Test scores from the Chapter 8 Pre-Algebra test:


As a list: 84 88 92 96 88 60 90 88 74 84 88 100 68 86 70 82
Same Data organized in a Stem and Leaf Plot:
Stem
Leaf
6
08
7
04
8
24468888
9
026
10
0
Key:
8 | 5 = 85

(Which would you rather use at 9:48 pm when you’re trying to finish your homework?)

Questions: What is the Maximum score? Minimum Score? Mode? Median? Mean?
How to make a Stem and Leaf Plot
“Back-to-back” Stem and Leaf Plots:
compare two data sets
Practice: First a small data set, then a
large one
Number of
Loggerhead
Turtle Eggs per
nest laid on AMI
during the 2015
Nesting Season,
as collected in
the field by
AMITW