An exercise physiologist investigated the effect of running speed on a treadmill on the heart rate of a healthy athlete. The heart rate was measured after 5 minutes of continuous running at each speed.
The results are shown in the table below.
| Running speed (km h−1\text{km h}^{-1}km h−1) | Heart rate (bpm\text{bpm}bpm) |
|---|---|
| 4 | 92 |
| 6 | 115 |
| 8 | 74 |
| 10 | 148 |
| 12 | 165 |
The physiologist identified one of the results as anomalous.
Explain which of these results is anomalous.