A group of students investigate the effect of exercise on heart rate.
They first measure their heart rate at rest by counting their pulse in beats per minute (bpm). Then, they exercise by jogging on a treadmill for 5 minutes. Immediately after exercise, they measure their heart rate again in bpm.
Their recorded results are:
Display these results in a suitable table.
Explain why heart rate is higher after exercise.
Explain how the students could improve their investigation.
