Final answer:
A typical barometric pressure reading of 750 mmHg in California is approximately equal to 0.9868 atm, which rounds to option b, 0.9865 atm, when converted using the conversion factor of 1 atm = 760 mmHg. which would be closer to option b, 0.9865 atm, considering typical rounding rules.
Step-by-step explanation:
To convert a barometric pressure reading from mmHg to atmospheres (atm), we can use the conversion factor where 1 atm is defined as exactly 760 mmHg. Given that a typical barometric pressure reading in California is about 750 mmHg, we can perform the conversion as follows:
Pressure in atm = (Pressure in mmHg) / (Conversion factor)
Pressure in atm = 750 mmHg / 760 mmHg/atm
Pressure in atm ≈ 0.9868 atm
When rounded to four decimal places as provided in the options, the pressure in atm is 0.9868 atm, which would be closer to option b, 0.9865 atm, considering typical rounding rules.