Edexcel Gcse Mathematics Linear 1ma0 Stem And Leaf Diagrams Answers
9.3 Stem & Leaf Diagrams
Revision notes on the topic Stem & Leaf Diagrams for the Edexcel GCSE Maths exam
Revision Notes
What is a stem-and-leaf diagram?
A stem – and – leaf diagram is a simple but effective way of showing data. It puts the data into order , puts it into classes ( groups ) and we can quickly see patterns. As the data is in order it is also useful for finding the median and quartiles .
What do I need to know?
Stem-and-leaf diagrams are particularly useful for two-digit data but can be used for bigger numbers. Two-digit data could be something like 26 but could also be 2.6. Due to this one of the essential things about a stem-and-leaf diagram is that it has a key.
You may also come across back-to-back stem-and-leaf diagrams which are used to compare two sets of data.
- Stem-and-Leaf diagrams
The digits from the data is split into two – stems and leaves. As in nature though, a stem can have more than one leaf. So the stems become our classes in our data.
eg The data value 26 would be split into a stem of 2 and a leaf of 6.
That will then mean the "2" becomes a class interval – ie the 20's.
Any other values in the 20's would join the same class – so a stem of 2 would have two leaves.
eg Draw a stem-and-leaf diagram for the following data
264532 272930 4036 37
As the data is not in order draw a rough diagram first to get the data values into the correct format:
Key: 2|6 means 26
And add a key so we know what the data is showing.
Example
Question
Edexcel GCSE Maths Notes
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Edexcel Gcse Mathematics Linear 1ma0 Stem And Leaf Diagrams Answers
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