3 marksStandard
The table shows the times, in minutes, taken by a group of people to complete a task.
| Time (minutes) | Mid-value | Frequency |
|---|---|---|
| first class | 10 | 10 |
| second class | 35 | 10 |
| third class | 55 | 5 |
- (a)[3]
Calculate an estimate of the mean time.
Work it out, then check it
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