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Cleanliness Rating Percentage
A student investigated the use of public transport in their local area by testing the following hypothesis: ‘The cost of fares is the most important factor in encouraging the use of local bus services.’
For one part of the enquiry the student interviewed 50 people to assess views about the local bus service. Figure 4 shows the results of the interviews.
| Aspect of the local bus service | Very poor | Poor | Reasonable | Good | Very good |
|---|---|---|---|---|---|
| Cost of fares | 16 | 21 | 13 | 0 | 0 |
| Availability | 7 | 25 | 13 | 5 | 0 |
| Punctuality | 16 | 13 | 17 | 4 | 0 |
| Cleanliness | 0 | 8 | 29 | 9 | 4 |
What percentage of the people who were interviewed considered cleanliness to be reasonable?
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Marking points
- 1 Gives 58 as the percentage value (the % symbol is preprinted).
Why this answer loses marks
I divided the total interviewed by the number choosing reasonable.
The named response is the part and everyone interviewed is the whole; reversing them cannot give the requested percentage share.