A weather forecast for one town states that the probability of rain tomorrow is 0.3. Taking that figure as given, what is the probability that it does not rain tomorrow there? Enter the probability as a decimal.
الإجابة الصحيحة
0.7
الشرح
Rain and no rain are the only two possibilities and exactly one of them must occur, so their probabilities make a whole between them and the answer is 1 - 0.3 = 0.7. Taking 0.3 away from 100 gives 99.7, which mixes the percentage scale into a decimal probability; a probability written as a decimal has to be subtracted from 1.