Answer: 0.7
Step-by-step explanation:
April has 30 days, and we know that it rained in 9 of them.
Then the probability that there will be rain in a random day, can be estimated as the quotient between the number of days where was rain and the total number of days, this probability will be:
P = 9/30 = 0.3
And we can extrapolate this probability to May.
Then we can estimate that the first day of May, the probability of rain will be around 0.3
Then the probability that it does not rain in the first day of may will be:
1 - 0.3 = 0.7
