Answer: the most accurate measurement of Pat's temperature in degrees Celsius is 37.3 degrees.
Explanation:
The conversion from Fahrenheit to Celsius is C = 5/9 (F-32).
First, we substitute Pat's temperature of 99.3 degrees Fahrenheit into the equation:
C = 5/9 (99.3-32)
C = 5/9 * 67.3
C = 37.3 degrees Celsius
So the most accurate measurement of Pat's temperature in degrees Celsius is 37.3 degrees.