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?
(point)
Responses
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
112 beats per second
1 Start Fraction 1 over 2 End Fraction beats per second
To find the average number of heartbeats per second, we need to calculate the average heart rate using the given data points.
Calculating the total change in heartbeats:
- From (4, 6) to (6, 9): The change is 9 - 6 = 3 heartbeats in 2 seconds.
- From (6, 9) to (10, 15): The change is 15 - 9 = 6 heartbeats in 4 seconds.
- From (10, 15) to (12, 18): The change is 18 - 15 = 3 heartbeats in 2 seconds.
Adding up the total changes:
3 heartbeats + 6 heartbeats + 3 heartbeats = 12 heartbeats
Calculating the total time:
2 seconds + 4 seconds + 2 seconds = 8 seconds
Dividing the total change in heartbeats by the total time:
12 heartbeats / 8 seconds = 1.5 beats per second
Therefore, the average number of heartbeats per second is 1.5 beats per second.
To find the average number of heartbeats per second based on the given graph, we need to calculate the total number of heartbeats over the total time interval.
From the graph, we see that the highest point on the y-axis is 18 beats, and the corresponding value on the x-axis is 12 seconds. This means that in 12 seconds, there are 18 heartbeats.
To calculate the average number of heartbeats per second, we divide the total number of heartbeats by the total time interval. In this case, the total number of heartbeats is 18, and the total time interval is 12 seconds.
Therefore, the average number of heartbeats per second is:
18 heartbeats / 12 seconds = 3 beats per second
So, the correct answer is: 3 beats per second.