Constructing a cumulative-frequency graph
Constructing a cumulative-frequency graph
TGM Original
The table records journey times for 40 students. Complete a cumulative-frequency table, draw a cumulative-frequency diagram using straight segments, then estimate the median and interquartile range.
| Time t (min) | \(0<t\le10\) | \(10<t\le20\) | \(20<t\le30\) | \(30<t\le40\) |
|---|---|---|---|---|
| Frequency | 4 | 12 | 16 | 8 |
Solution:
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Answer:Median approximately 22.5 min; IQR approximately 13.75 min.
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