91Ó°ÊÓ

The average life of a person according to the world health organization \({\bf{2015}}\)report is \({\rm{79 years}}\).

Conversion of \({\rm{79 years}}\) into minutes.

\(\begin{array}{c}{\rm{79 years}} = {\rm{79 years}} \times \frac{{365{\rm{ days}}}}{{1{\rm{ year}}}}\\ = \left( {{\rm{79}} \times 365} \right){\rm{ days}} \times \left( {\frac{{24{\rm{ hr}}}}{{1{\rm{ day}}}}} \right)\\ = \left( {{\rm{79}} \times 365 \times 24} \right){\rm{ hr}} \times \left( {\frac{{{\rm{60 min}}}}{{1{\rm{ hr}}}}} \right)\\ = 41522400{\rm{ min}}\end{array}\)

A heart beats in a minute is\(80\)times. Therefore in\({\rm{79 years}}\), it will beat,

\(\begin{array}{c}{\rm{Heart beats}} = 41522400{\rm{ min}} \times {\rm{80 }}{{{\rm{beats}}} \mathord{\left/ {\vphantom {{{\rm{beats}}} {{\rm{min}}}}} \right.} {{\rm{min}}}}\\ = 3.322 \times {10^9}{\rm{ beats}}\end{array}\)

Hence, the heartbeats in a lifetime is \(3.322 \times {10^9}{\rm{ beats}}\).