Final answer:
The proper depth for compressions during CPR is at least 5 cm deep, with a recommended rate of 100 compressions per minute.
Step-by-step explanation:
The proper depth for compressions that rescuers should try to achieve during CPR is at least 5 cm deep. This means that rescuers should compress the chest of the patient at a depth of at least 5 centimeters. Additionally, it is recommended to perform chest compressions at a rate of 100 compressions per minute, which is equal to the beat of the song "Staying Alive" by the Bee Gees.