Based on weather data collected in Racine, Wisconsin, on Christmas Day, the weather 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 also be cloudy.