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:
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
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
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.
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
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
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