Stem and leaf diagrams. Stem and leaf diagrams show the distribution of the data like a bar chart with the numbers forming the bars. The diagrams can also be used to find measures such as the median. Example 1. Ann measured 21 sunflower leaves (in mm) as part of her science project. 172 147 166 171 147 151 152 189 153 147 148 155 158 167 189 159 165 164 166 178 188 Draw a stem and leaf diagram to show the shape of this data.

172 147 166 171 147 151 152 189 153 147 148 155 158 167 189 159 165 164 166 178 188 14 15 16 17 18 7 7 7 8 14 15 16 17 18 7 7 7 8 1 2 3 5 8 9 1 2 3 5 8 9 6 7 5 4 6 4 5 6 6 7 2 1 8 1 2 8 9 9 8 8 9 9 KEY: 14 2 means 142 mm

Example 2. Mr Jones has 20 students. They all recently took an exam. The marks were: 139 101 119 113 102 124 118 125 140 125 124 104 124 131 103 122 136 112 118 119 108 Draw a stem and leaf diagram to show the shape of this data. 10 11 12 13 14 KEY: 12 4 means 124 marks.

172 147 166 171 147 151 152 189 153 147 148 155 158 167 189 159 165 164 166 178 188 14 15 16 17 18 14 15 16 17 18 KEY: 14 2 means 142 mm

Example 2. Mr Jones has 20 students. They all recently took an exam. The marks were: 139 101 119 113 102 124 118 125 140 125 124 104 124 131 103 122 136 112 118 119 108 Draw a stem and leaf diagram to show the shape of this data. 10 11 12 13 14 KEY: 12 4 means 124 marks.