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As the only lifeguard performing CPR on a 7-year-old child, you would perform cycles of:

  1. 15 chest compressions and 2 ventilations

  2. 20 chest compressions and 1 ventilation

  3. 25 chest compressions and 1 ventilation

  4. 30 chest compressions and 2 ventilations

The correct answer is: 15 chest compressions and 2 ventilations

When performing CPR on a child, the American Heart Association recommends 15 chest compressions followed by 2 ventilations. This combination allows for proper oxygen circulation and mimics the natural breathing pattern of a child. Option B has fewer ventilations which may not provide enough oxygen to the child's body, and options C and D have too many compressions which may disrupt proper blood flow. It is important to follow the recommended guidelines for CPR in order to provide the best chances of survival for the victim.