Question

Use the image to answer the question.

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?

(1 point)
Responses

3 beats per second
3 beats per second

2/3 beat per second
Start Fraction 2 over 3 End Fraction beat per second

1 1/2 beats per second
1 Start Fraction 1 over 2 End Fraction beats per second

2 beats per second

Answer 1

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**.