Answer:
Average heart rate for the last 6 days = 56
Explanations:
Average rate = (Total rate) / Number of days
The athlete's average heart rate after 10 days = 58
Average heart rate after 10 days = (Total heart rate after 10 days) / 10
58 = Total heart rate after 10 days / 10
Total heart rate after 10 days = 58 x 10
Total heart rate after 10 days = 580
The athlete's heart rate for the first 4 days = 61
Average heart rate for the first 4 days = Total heart rate for the first 4 days)/4
61 = Total heart rate for the first 4 days / 4
Total heart rate for the first 4 days = 61 x 4
Total heart rate for the first 4 days = 244
Total heart rate for the last 6 days = (Total heart rate for the 10 days) - (Total heart rate for the first 4 days)
Total heart rate for the last 6 days = 580 - 244
Total heart rate for the last 6 days = 336
Average heart rate for the last 6 days = Total heart rate for the last 6 days /6
Average heart rate for the last 6 days = 336/6
Average heart rate for the last 6 days = 56