Final answer:
To convert the mean daily high temperature in Seattle for April from Fahrenheit to Celsius, use the formula °C = 5/9 (°F - 32), which results in approximately 15.000°C when converted from 59°F.
Step-by-step explanation:
To compute the mean of Seattle's daily high temperature in degrees Celsius, we need to apply the given formula for converting degrees Fahrenheit (°F) to degrees Celsius (°C), which is °C = 5/9 (°F - 32).
The given mean temperature in Seattle for April is 59°F. Plugging this into our formula gives us:
Mean °C = 5/9 (59°F - 32) = 5/9 (27) ≈ 15.000°C
Therefore, the daily high temperature mean in Seattle for April, rounded to three decimal places in Celsius, is approximately 15.000°C.