A graph shows an x-axis representing time in seconds ranging from 0 to 12 in increments of 2. The y-axis represents heartbeats ranging from 0 to 18 in increments of 3. The graph shows a line representing resting heart rate.
What is the average number of heartbeats per second?
Since the graph shows a resting heart rate, the average number of heartbeats per second would be the same as the slope of the line representing the resting heart rate. By observing the graph, it appears that the line has a slope of 1, meaning that for every second that passes, there is 1 heartbeat. Therefore, the average number of heartbeats per second would be 1 beat per second, which corresponds to option D.
