To determine the correct range for the average adult heart rate at rest, we can review the options provided:
1. 80-100 beats per minute
2. 72-80 beats per minute
3. 50-68 beats per minute
4. 60-72 beats per minute
We need to identify which of these options accurately represents the average adult heart rate when at rest.
### Analysis of the Options:
1. 80-100 beats per minute:
- This range seems a bit high for a resting heart rate. The higher end of this range might be observed in situations involving stress or physical activity rather than at rest.
2. 72-80 beats per minute:
- While closer to a resting range, the lower boundary of this option is slightly above what is typically considered average. The range is somewhat narrow and does not account for the lower end of a typical resting heart rate.
3. 50-68 beats per minute:
- This range is lower than the typical average for an adult at rest. Although some healthy adults may have heart rates within this range, especially if they are athletes, it's generally on the lower side for the average population.
4. 60-72 beats per minute:
- This range is well within the commonly accepted range for a resting heart rate for an average adult. It captures both the lower and higher ends of what is typically observed in most adults.
Given these analyses, the most accurate range that reflects the average adult heart rate when at rest is:
[tex]\[
\boxed{60-72}
\][/tex]
Thus, the correct answer is [tex]\(60-72\)[/tex] beats per minute.
