What is the average number of heartbeats per second
Y axis: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
(6, 4) (9,6) (15, 10) (18, 12)
X axis: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Answers:
1. 3 beats per second
2. 1 1/2 beats per second
3. 2/3 beats per second
4. 2 beats per second
To find the average number of heartbeats per second, we need to calculate the total number of heartbeats and divide by the total time. From the given points on the graph, we can see that at time 6, there are 4 heartbeats, at time 9 there are 6 heartbeats, at time 15 there are 10 heartbeats, and at time 18 there are 12 heartbeats.
The total number of heartbeats is 4 + 6 + 10 + 12 = 32.
The total time is 18 - 6 = 12 seconds.
Therefore, the average number of heartbeats per second is 32/12 = 2 2/3, which is approximately 2 2/3 beats per second.
The correct answer is 3. 2/3 beats per second.