video1.0<iframe src="https://www.loom.com/embed/c6d0dfdd371f4279ae0b21903a03a879" frameborder="0" width="960" height="720" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>720960Loomhttps://www.loom.com720960https://cdn.loom.com/sessions/thumbnails/c6d0dfdd371f4279ae0b21903a03a879-00001.jpg66p: The graph shows the average heart rate for 15 people before, during, and after a period of strenuous exercise. The horizontal axis shows time, in minutes, and the vertical axis shows average heart rate, in beats per minute. The exercise period began at 5 minutes and ended at 15 minutes. Approximately how many minutes did it take after the exercise period ended for the average heart rate to first return to the average heart rate before the exercise period began?