by The Open University
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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.
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