To determine how many times a person breathes in an hour when not exerting themselves, follow these steps:
1. First, recognize that an average person takes about 16 breaths per minute when not exerting themselves.
2. Since there are 60 minutes in an hour, you can multiply the number of breaths per minute by the number of minutes in an hour to find the total number of breaths per hour.
3. Therefore, the calculation is:
[tex]\[
\text{Number of breaths per hour} = 16 \, \text{breaths/minute} \times 60 \, \text{minutes/hour}
\][/tex]
4. By performing this multiplication:
[tex]\[
16 \times 60 = 960
\][/tex]
5. So, an average person takes approximately 960 breaths in an hour when not exerting themselves.
Looking at the given options:
- 60
- 100
- 600
- 900
The closest accurate number is approximately 960 breaths per hour, closely matching option:
- 900
Thus, the answer is:
O 900
