Question

what bone do we perform compressions on?
riba
sternum
clavicle
what does heart rate measure?
the force the heart exerts against the walls of arteries as it pumps the blood out to the body
the number of times your heart beats per minute
the range for \average/normal\ heart rate
40 - 60 beats per minute
60 - 100 beats per minute
100 - 120 beats per minute

Explanation:

For the first question, during CPR (cardiopulmonary resuscitation), chest compressions are performed on the sternum. The ribs are part of the rib - cage surrounding the thoracic cavity but are not the site for compressions. The clavicle (collarbone) is also not the correct bone for compressions.
For the second question, heart rate is defined as the number of times the heart beats per minute. The force the heart exerts against the walls of arteries as it pumps blood out to the body is blood pressure.
For the third question, the normal/average heart rate range for adults is 60 - 100 beats per minute. A heart rate of 40 - 60 beats per minute is often seen in very fit individuals (athletic bradycardia) or in some pathological conditions (if it causes symptoms). A heart rate of 100 - 120 beats per minute is considered tachycardia (fast heart rate) in a resting state for adults.

Answer:

1. Sternum
2. The number of times your heart beats per minute
3. 60 - 100 beats per minute