How do cellphones calculate heart rate?

How can I calculate this average heart rate?? Help?

  • Tasha checked her pulse three times in one day. Her first pulse rate was 75pm (beats per minute). The second rate was 68bpm. The third was 80bpm. What is Tasha's average heart rate? How can I calculate this?? I'm confused

  • Answer:

    add all 3 together and divide by 3. But its really not accurate as heart beat like blood pressure is constantly changing. The amount of activity your doing plus stress, and many other factors contribute to your rate at any given reading!

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Add them up & divide by 3 Math homework? ; thats cheating

add all 3 together! than the total you get you divide from 3! 75 + 68 + 80= total divide by 3

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