Question

How many times does your heart beat during your lifetime? Round the answer to the nearest power of 10 and then express your answer as the order of magnitude. For instance, if your estimated answer is 3×105, enter 5. If your estimated answer is 8.7×105, you should enter 6 (rounding up to the next power of 10).

Answer 1

29.8 × 10⁸

Explanation:

The average life span for human is 79 years

And healthy heart beats 72 times a minute

Now,

Total number of minutes in 79 years = 79 × 365 × 24 × 60

therefore,

The total number of times heart beats in the life span

= 72 × 79 × 365 × 24 × 60

= 2989612800 times

now, to convert it into an answer with 10⁸

divide the result with 10⁸

Hence,

The total number of times heart beats in the life span = 29.8 × 10⁸ times