5.2.1 Beta endorphin concentration (collapsed runners)
The final column of Table 4 contains the blood plasma β endorphin concentrations for eleven runners who collapsed towards the end of the Great North Run. The observations are already sorted. They are as follows.
| 66 | 72 | 79 | 84 | 102 | 110 | 123 | 144 | 162 | 169 | 414 |
Eleven is an odd number, so the middle value of the data set is the sixth value (five either side). So, in this case, the sample median is 110 pmol/l.