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Question
Give the answer in scientific notation:
A human heartbeats at an average of 80 beats per minute. How many times does it beat in a year?
Sum
Solution
Heartbeat per minute = 80 beats
a year
One year = 365 days
= 365 × 24 hours
= 365 × 24 × 60 minutes
∴ Heartbeats in a year = 365 × 24 × 60 × 80
= 42048000
= 4.2048 × 107
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Chapter 1: Numbers - Exercise 1.7 [Page 47]
