Chocolate bar sales

Chocolate bar sales

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about creating a stem-and-leaf graph.
Andre's school is raising money by selling chocolate bars.
He wrote down the number of chocolate bars each person in his class has sold.

Here are Andre's results:
 

25, 2, 12, 7, 0, 41, 10, 18, 15, 11, 34, 18,
21, 12, 9, 13, 16, 22, 8, 37, 4, 52, 16, 0
 
a)
 
 
 
 
Complete the stem-and-leaf graph using Andre's results. The 'stem' has been done for you.
Record the 'leaves' in the order that they appear in the box above.
 
 
 

 
b)
 
 
Now complete the stem-and-leaf graph below by ordering the numbers in each of the leaves from part a).
 
 
 
Task administration: 
This task is completed with pencil and paper only.
Levels:
3, 4
Curriculum info: 
Maths, Statistics, Statistical investigations
Keywords: 
stem-and-leaf graphs, graph construction
Description of task: 
Students present data on the number of chocolate bars sold in a stem-and-leaf graph. The data is then ordered into a second graph.
Curriculum Links: 
This resource can be used to help to identify students' ability to construct a stem-and-leaf graph.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Statistical investigations, set 4
Statistical investigations, set 5
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
 

Y7 (03/2001)

a)

All leaves recorded. [NOTE: The order may differ from that recorded below.]
 

 
1-2 errors made in recording (missing digit/s or, extra digit recorded. Treat as one error if leaves are presented in 2-digit format).

All correct -
very difficult
 
1-2 errors -
difficult

b)

All leaves recorded and in numerical order.
[NOTE: Accept errors if the numbers on this graph are the same as those used for the graph drawn in a) but are still ordered correctly.]
 

difficult