### Home > PC3 > Chapter 8 > Lesson 8.1.1 > Problem 8-12

8-12.

Sharilyn likes to exercise. When she goes to the gym she lifts weights and then does her cardio workout. To monitor the cardio part of her workout, Sharilyn uses a heart rate monitor. The graph to the right shows Sharilyn’s heart rate while she was on the treadmill.

Approximately how many times did Sharilyn’s heart beat during her

-minute workout? Approximate the area under the curve using a trapezoid.

What was Sharilyn’s approximate average heart rate during her

-minute workout? Divide your answer in part (a) by

minutes.