Stem and Leaf Diagrams

1
Stem and Leaf Diagrams
A Stem and Leaf diagram not only allows you to
display the data but it allows you to retain the
original figures
Consider the ages of 32 people in a caravan park
66 6 62 19 20 35 26 61 13 61 64 11 39 22 9 37 18 1
3 16 67 9 23 12 9 23 12 9 37 18 20 11 25
First step select an appropriate stem and then
add the leaves
Second step sort the data into numerical order
0 10 20 30 40 50 60
6 9 9 9
0 10 20 30 40 50 60
6 9 9 9
9 3 1 8 3 6 2 2 8 1
1 1 2 2 3 3 6 8 8 9
0 6 2 3 3 0 5
0 0 2 3 3 5 6
5 9 7 7
5 7 7 9
2 7
2 7
4 1
1 4
6 1
1 6
2
Back to Back Stem and Leaf Diagrams
Using a back-to-back stem and leaf diagram to
compare two sets of data two sets of data. The
following scores were obtained by 32 students in
a Mathematics and Science assessment
MATHEMATICS
SCIENCE
40 34 45 56 21 68 55 44 32 45 65 21 38
52 38 31 22 58 76 33 20 34 60 71 65 72
33 41 12 39 23 42
21 57 77 32 33 78 22 12 39 33 44 20 67
36 37 69 56 27 13 37 59 23 47 19 65
12 75 34 22 38 21 47
10 20 30 40 50 60 70
2 3 9 2
2
1 2 0 7 3 2 1
3 0 2 1 1
2 3 9 3 6 7 7 4 8
9 3 4 3 1 8 8 2 4
4 7 7
2 1 5 4 5 0
7 6 9
8 2 5 6
7 9 5
5 0 5 8
7 8 5
2 1 6