A typical person has an average heart rate of 75.0 beats/min. Calculate the following a) How many beats does she have in 7.0 years? b) How many beats in 7.000 years? Pay close attention to significant figures in this question.

Let us first convert years to minute.

7 years * (365 days / year) * (24 hours / day) * (60 minutes / hour) = 3,679,200 minutes

a. beats = 75.0 beats/min * 3,679,200 minutes

beats = 275,940,000 beats

Since the original given is 7.0 years (2 significant figures), therefore:

beats = 270,000,000 beats

b beats = 75.0 beats/min * 3,679,200 minutes

beats = 275,940,000 beats

Since the original given is 7.000 years (4 significant figures), therefore:

beats = 275,900,000 beats