Two way tables
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Using a Venn diagram to understand the problem
The 4 cases indicated in the two-way tables can also be shown with a Venn diagram.
Detailed description of diagram
The regions of the Venn diagram are as shown.
| DVD and MP3 |
| DVD and not MP3 |
| not DVD and MP3 |
| not DVD and not MP3 |
| MP3 player | Not MP3 player | |
|---|---|---|
| DVD player | 36 | 12 |
| Not DVD player | 6 | 26 |
What other questions can you ask about the DVD and MP3 players?
Here are two questions. Can you think of some more?
- How many students have both an MP3 player and a DVD player?
- How many students have only one of the two players?
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