To calculate the average number of heartbeats per second, we'll need to know the total number of heartbeats and the total time represented in the graph.
From the information provided, the y-axis represents heartbeats from 0 to 18, and based on increments of 3, it means the total heartbeats could potentially be measured at different time points on the x-axis, which ranges from 0 to 12 seconds.
If we assume that the resting heart rate is relatively constant throughout the time range and that the total heartbeats at the end of the given time (12 seconds) is around 18 beats (from the max value of y), we can calculate the average.
- Total beats: 18 (at the maximum point)
- Total time: 12 seconds
Now, we can calculate the average heart rate:
\[ \text{Average heartbeats per second} = \frac{\text{Total beats}}{\text{Total time}} = \frac{18 \text{ beats}}{12 \text{ seconds}} = 1.5 \text{ beats per second} = 1 \frac{1}{2} \text{ beats per second} \]
Thus, the response is 1 1/2 beats per second.