The dry-bulb temperature is 78°F and the wet-bulb temperature is 62°F. What is the relative humidity?

Correct Answer: Option C — 39%

Psychrometric table calculations using a dry-bulb temperature of 78F and wet-bulb temperature of 62F (a wet-bulb depression of 16F) intersect to yield a relative humidity value of 39 percent, as referenced in standard meteorological tables in Bowditch.