Question

How many heartbeats in a typical human lifetime? Enter answer as a number ( not as a power of ten) and in one significant figure.

Answer 1

Let the average life span of the human life is 80 years,

Total number of heart beat in 1 min =72

Hence total number of heartbeat $=80 yr\times (\frac{365 days}{1 yr})\times (\frac{24 hour}{1 days})\times (\frac{60min}{1 hr})\times (\frac{72 heart beat}{1 min})$

$=3027456000$