Find the centroid of the region shown, not by integration, but by locating the centroids of the rectangles and triangles and using additivity of moments. 
Definitions:
Arrhythmia
An irregularity or abnormality in the heart's rhythm, which can range from harmless to life-threatening.
SA Node
Sinoatrial Node; the heart’s natural pacemaker, responsible for initiating the electrical impulses that determine the heart rate.
Pulse Oximetry
A non-invasive method to measure the oxygen saturation level of the blood using a device attached usually to a fingertip.
Sleep Apnea
A condition characterized by pauses in breathing during sleep.
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