So, you're looking for the probability, or percentage of "no rain". First, look at the probability that it will rain: 0.63 means 63%. So, subtract 63 from 100.
100 - 63 = 37
Therefore, the probability that there will be no rain is 0.37, or 37%.
The answer would be .37, or 37%. 100 - 63 = 37.
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