Answer:
probability of rain = 0.25
Explanation:
The odds for encountering rain on a 500-mile car trip are 3 to 1.
This means that out of any 4 instances of a 500 mile trip, it is expected to encounter rain 1 time. Expressing this in probability format:
Probability of rain = (number of occurance of rain)/(number of instances of 500 mile trip) = 1/4 = 0.25
Expressing it as a percentage, there is 25% chance of encountering rain on such a trip.