1. Stem and Leaf Plots/Diagrams
A stem and leaf plot is a frequency diagram in which the raw data is displayed together with its frequency. The data is then placed in suitable groups.
Example.
The following data gives the marks out of 60 for a maths test. Place the data in a stem and leaf diagram.
28, 38, 42, 5, 13, 23, 14, 38, 56, 20, 32, 47, 58, 3, 18, 19, 42, 48, 29, 14, 24, 28, 50, 31, 35
Stem
Leaf
units
0 – 9
20 – 29
30 – 39
40 – 49
50 – 59
tens 1 2 3 4 5 3 5 3 4 4 8 9
Median is the 13th data value 3 4 8 8 9 1 2 5 8 8 2 2 7 8 6 8

2. Stem and Leaf Plots/Diagrams
The stem and leaf plot below shows the masses in kg of some people in a lift.
How many people were weighed?
What is the range of the masses?
Find the median mass.
Stem
Leaf 3 4 5 6 7 8 1 2
tens
units
Median is the mean of the 8th and 9th data values.
(c) 56 kg
(a) 16 people.
(b) 86 – 31 = 55 kg