Final answer:
For one-person CPR, the correct compression-to-breath ratio is 30:2, with compressions being at least 5 cm deep and at a rate of 100 per minute.
Step-by-step explanation:
When performing one-person CPR on an unconscious victim, the proper compression-to-breath ratio is 30:2. This means you should give 30 chest compressions followed by 2 rescue breaths. CPR chest compressions should be at least 5 cm deep and delivered at a rate of 100 compressions per minute, which is the rhythm of the song "Staying Alive" by the Bee Gees. Remember that high-quality chest compressions are vital and should be continued until the victim regains spontaneous contraction or is declared deceased by a healthcare professional.