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Stem and Leaf Diagrams Stem and leaf diagrams are a pictorial way of showing statistics The important parts of a stem and leaf diagram are The Title The.

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Presentation on theme: "Stem and Leaf Diagrams Stem and leaf diagrams are a pictorial way of showing statistics The important parts of a stem and leaf diagram are The Title The."— Presentation transcript:

1 Stem and Leaf Diagrams Stem and leaf diagrams are a pictorial way of showing statistics The important parts of a stem and leaf diagram are The Title The stem The leaves in order starting from the stem The number of items The key Class Maths Marks n = 20 2 / 3 means a mark of 23

2 A group of students measured their pulse rates in beats per minute. The results were Draw a Stem and Leaf diagram to show this We need a title Pulse rates (beats per minute) We need the stems We need the Leaves We need to reorder the leaves We need to write in nn = 15 We need the key 6 / 2 means 62 beats per minute

3 A group of students were asked how much pocket money they get. The results were. £6.60 £6.90 £6.20 £5.80 £7.40 £5.60 £6.70 £7.20 £6.10 £6.20 £5.90 £6.00 £7.20 £5.80 £6.30 Draw a Stem and Leaf diagram to show this n = 156 / 2 means £ Pocket money Note this gives us the same diagram as the previous example. This shows the importance of the title and key.

4 Draw Stem and Leaf Diagrams for the following sets of data The speed of cars, in mph, passing police speed check John took a note of how far, in metres, he was able to hit a golf ball Speed in mph n = 18 4/3 means 43mph Distance in metres n = 21 12/3 means 123m

5 Stem and Leaf diagrams can be used to compare 2 sets of data. To do this we draw a back to back stem and leaf diagram Maths marks for class 1AMaths marks for class 1B n = 19n = 203/2 means a mark of 32 How many students in 1A had a mark of 31? How many students in 1B had a mark of 12? Which class appears to be best at Maths? 2 3 1A

6 Use the Back to Back Stem and Leaf Diagram to answer the questions Books borrowed from the library This weekLast week n = 10n = 10 2/0 represents 20 books How many books were borrowed at level 3 this week ? How many books were borrowed at level 4 last week Which week was best for the library How many books were borrowed last week altogether 65 ? 129 ?This week ? 387


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