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Collecting and recording data - 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 | 
|
|
| 5 - 9 |
|
|
| 10 - 14 |
|
|
| 15 - 19 |
|
|
| 20 - 24 |
|
|
| 25 - 29 |
|
|
| 30 - 34 | ||
| 35 - 39 |
|
|
| 40 - 44 | ||
| 45 - 49 |
|
|
| more than 49 |
The completed frequency table is known as a grouped frequency table.
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