1986 MCM A: Hydrographic Data
The table below gives the depth Z of water in feet for surface points with rectangular coordinates X, Y in yards [table of 14 data points omitted]. The depth measurements were taken at low tide. Your ship has a draft of five feet. What region should you avoid within the rectangle (75,200) x (-50, 150)?
| X | Y | Z |
|---|---|---|
| 129.0 | 7.5 | 4 |
| 140.0 | 141.5 | 8 |
| 108.5 | 28.0 | 6 |
| 88.0 | 147.0 | 8 |
| 185.5 | 22.5 | 6 |
| 195.0 | 137.5 | 8 |
| 105.5 | 85.5 | 8 |
| 157.5 | -6.5 | 9 |
| 107.5 | -81.0 | 9 |
| 77.0 | 3.0 | 8 |
| 162.0 | -66.5 | 9 |
| 162.0 | 84.0 | 4 |
| 117.5 | -35.5 | 9 |