Posted by **anonymous** on Wednesday, September 6, 2006 at 8:37am.

Estimate the number of breaths taken during 70 years, the average life span of a person.

Estimate the number of times your heart beats in an average day.

And your thinking is...?

We will be happy to critique your thinking or work.

- estimate -
**rosa**, Monday, February 14, 2011 at 8:10am
4 x 10^8 breaths

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