Question

Human heart, on the average, beats 72 times per minute. It's frequency is

Answer 1

72 times per minute means 72 times in 60 seconds. Hence it means that the beats  

per second is equivalent to 72 upon 60 which is roughly equal to 1.6 beats per

second

Answer 2

its frequency is number of beats /time (in second) 72/60 seconds .......1.2