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Maths

Collecting and recording data

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Grouping data

When there are a large number of possible outcomes, you will usually need to group the data. To do this, first decide on your class intervals based on the range of likely possible answers.

Investigation example

You are carrying out a survey to determine the number of magazines bought by your classmates in the past year. The possible answers are likely to range from 0 to 100, so you might draw a tally chart with groupings similar to the one below:

Number of magazines Tally Frequency
0 - 4
Tally five
Tally three
 
5 - 9 Tally five  
10 - 14
Tally five
Tally of 2
 
15 - 19 Tally three  
20 - 24
Tally five
 
25 - 29 Tally three  
30 - 34    
35 - 39 Tally five  
40 - 44    
45 - 49 Tally three  
more than 49    

The completed frequency table is known as a grouped frequency table.

Activity

Collecting and recording data activity

Does everything tally up? Try this activity.

Play

Whack Attack

Whack and zap mad professors and aliens!

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