Final answer:
The normal heart rate for a child over 6 years old is 60-100 beats per minute. Heart rate varies with age, decreasing from infancy to adolescence, and deviations from the normal range may indicate health issues.
Step-by-step explanation:
The normal heart rate for a child older than 6 years old is 60-100 beats per minute (Option A). For adults, the same range is considered normal. In pediatric populations, heart rates vary considerably with age and generally decrease from infancy to adolescence. In contrast, conditions such as bradycardia occur when the resting heart rate drops below 60 bpm, whereas tachycardia involves a resting rate above 100 bpm. It's important to note that athletes often have lower heart rates; however, very low rates may indicate underlying health issues if accompanied by symptoms like dizziness or chest discomfort.