Final answer:
The humidity is falling at a rate of 2 percentage points per hour. Over the next 20 minutes, the estimated change in humidity would be approximately 0.6667 (repeating) percentage points.
Step-by-step explanation:
The question involves estimating the change in humidity over a period of time using a given rate of decrease. The rate at which the humidity is falling is 2 percentage points per hour. To estimate the change in humidity over the next 20 minutes, we need to convert the hourly rate to a rate per minute and then multiply by 20 minutes.
There are 60 minutes in an hour, so the rate of 2 percentage points per hour is equivalent to 0.0333 (repeating) percentage points per minute (2 divided by 60). Multiplying this rate by 20 minutes gives us an estimated change of 0.6667 (repeating) percentage points over the next 20 minutes.