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?
A 2 beats per second
B 2/3 beat per second
C 1 1/2 beat per second
D 3 beat per second
To find the average number of heartbeats per second, we need to determine the total number of heartbeats divided by the total time.
From the graph, we can see that the resting heart rate ranges from 6 to 18 heartbeats, which is a difference of 12 heartbeats. The time range is from 0 to 12 seconds, which is a difference of 12 seconds.
Therefore, the average number of heartbeats per second is 12 heartbeats divided by 12 seconds, or 1 beat per second.
So, the correct answer is C) 1 1/2 beat per second.
To find the average number of heartbeats per second, we need to determine the total change in heartbeats and the total change in time.
From the graph, we can see that the resting heart rate increases from 6 to 18 beats over a time interval of 12 seconds. This gives us a total change in heartbeats of 18 - 6 = 12 beats.
The total change in time can be determined by subtracting the initial time (0 seconds) from the final time (12 seconds), which gives us a total change in time of 12 - 0 = 12 seconds.
To find the average number of heartbeats per second, we divide the total change in heartbeats by the total change in time:
Average number of heartbeats per second = total change in heartbeats / total change in time
= 12 beats / 12 seconds
= 1 beat per second
Therefore, the average number of heartbeats per second is 1 beat per second.
The correct answer is C) 1 1/2 beat per second.
To find the average number of heartbeats per second, we need to know the total number of heartbeats and the total time.
Looking at the graph, we can see that the line representing resting heart rate passes through points (4, 6), (6, 9), (10, 15), and (12, 18).
We can calculate the total number of heartbeats by summing the y-values of these points: 6 + 9 + 15 + 18 = 48 heartbeats.
Next, we need to calculate the total time. From the x-axis, we can see that the time range is from 0 to 12 seconds, with increments of 2 seconds. So, the total time is 12 seconds.
Now, we can calculate the average number of heartbeats per second by dividing the total number of heartbeats by the total time: 48 heartbeats / 12 seconds = 4 beats per second.
Therefore, the average number of heartbeats per second is 4 beats per second.