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. The line passes through the following plotted points: left parenthesis 4 comma 6 right parenthesis; left parenthesis 6 comma 9 right parenthesis; left parenthesis 10 comma 15 right parenthesis; and left parenthesis 12 comma 18 right parenthesis.

What is the average number of heartbeats per second?

(1 point)
Responses

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

2 beats per second
2 beats per second

3 beats per second
3 beats per second

23 beat per second
Start Fraction 2 over 3 End Fraction beat per second
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Answer 1

To calculate the average number of heartbeats per second, we need to determine the change in heartbeats divided by the change in time.

The change in heartbeats is 18 - 6 = 12 beats.
The change in time is 12 - 4 = 8 seconds.

Therefore, the average number of heartbeats per second is 12/8 = 1.5 beats per second.

Answer: Start Fraction 1 over 2 End Fraction beats per second