How
I know it's ambiguously worded but eh.
Scroll for answer spoiler tags are fubared:
I took it with a grain of salt and made a simple math problem out of it.
Saturday = 100
Sunday = 100
Total 200
Chance of rain = 50%
Chance of rain = 30%
Total 80
200-80 = 120 /2 = 60%
... but if you want to get all goofy about it. okay.
I answered " 'Sunny' is mentioned but not defined and it is impossible to determine if the events are independent. The question is too ambiguous to draw a conclusion with the data given.'
If you assume that 'not rainy' = 'sunny' and that both days are independent events:
(50/100) of sun on Saturday and (70/100) of sun on Sunday (30% chance rain = 70% sun)
(.50*.70) = 35% chance of sun over both days assuming independence
You should think about that hard though.
Answer is:
Assuming again that not rainy = sunny. They both occur on the same weekend so they are a union:
(.50 + .70) - 1 = .2
20% chance of it being sunny over both days of the same weekend.