Historically,on Christmas day the weather in a certain Midwestern city has had the following distribution:
Event Relative Frequency
Clear & dry 0.20
Cloudy & dry 0.30
Rain 0.40
Snow 0.10
a- Based on these data, what is the probability that next Christmas will be dry?
b- Based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
c- Supposing next Christmas is dry, determine the probability that it will be also cloudy?