A group of students collected data on pedestrian footfall at 11 different locations in a town centre on a Saturday afternoon. The results are shown in the table below.
| Survey Location | Pedestrians counted (per 10 minutes) |
|---|---|
| High Street North | 45 |
| Market Square | 120 |
| Alley Lane | 15 |
| Station Road | 85 |
| Broad Street | 62 |
| Shopping Centre Entrance | 210 |
| Library Plaza | 98 |
| Church Yard | 54 |
| High Street South | 140 |
| Town Hall Steps | 175 |
| East Gate | 32 |
Calculate the upper quartile value of this dataset. You must show your working out.