The heights of 400 students were measured. The results are displayed in this cumulative frequency polygon.
Use the polygon to estimate the interquartile range. (2 marks)
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`text(See graph for values:)`
♦ Mean mark 46%.
| `IQR` | `= Q_3 – Q_1` |
| `= 172 – 136` | |
| `= 36\ text(cm)` |
