Final answer:
The correct answer is 4) 95. An end-tidal concentration of oxygen greater than 95% indicates a high concentration of oxygen in the exhaled breath.
Step-by-step explanation:
The correct answer is 4) 95.
An end-tidal concentration of oxygen greater than 95% indicates a high concentration of oxygen in the exhaled breath. This can be achieved through various means such as oxygen therapy or breathing in highly oxygenated environments.
For example, a patient receiving oxygen therapy through a nasal cannula may have an end-tidal concentration of oxygen greater than 95%.