Question

The probability it will rain today is 0.4 and the probability it will rain tomorrow is 0.3. The probability it will rain both days is 0.2. What is the probability it will rain today or tomorrow?

Answer 1

The probability it will rain today is 0.4 and the probability it will rain tomorrow is 0.3. The probability it will rain today or tomorrow is the sum of the probabilities of the rain today and tomorrow minus the probability of the rain in both two days. Hence, the asnwer is 0.4 + 0.3 - 0.2 equal to 0.5.