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Nov 2007 p6 q5
2480
The arrival times of 204 trains were noted and the number of minutes, t, that each train was late was recorded. The results are summarised in the table.
| Number of minutes late (t) | -2 ≤ t < 0 | 0 ≤ t < 2 | 2 ≤ t < 4 | 4 ≤ t < 6 | 6 ≤ t < 10 |
|---|---|---|---|---|---|
| Number of trains | 43 | 51 | 69 | 22 | 19 |
- Explain what -2 ≤ t < 0 means about the arrival times of trains.
- Draw a cumulative frequency graph, and from it estimate the median and the interquartile range of the number of minutes late of these trains.
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