In a month with 30 days, each day either rains or doesn't rain. If it rained for 15 days, what is the probability that it will rain on the last day of the month?
To solve this question, let's think about the following points:
1. We know that there are 30 days in the month and it rained for 15 days.
2. However, this information doesn't provide any indication of whether it will rain on the last day or not.
3. Since the weather on one day doesn't necessarily affect the weather on another day, we can treat the last day as an independent event.
4. So, the probability of it raining on the last day is just like any other day - it either rains or it doesn't rain.
5. Thus, there are two possible outcomes (rain or no rain), and only one of them is considered a success (rain).

Final answer: The probability of it raining on the last day of the month is 1/2 or 50%.