A1 30/90 OR 1/3
A2 30/90 OR 1/3
A3 50/90 OR 5/9
A4 FALSE due to overlap since they seem to be not mutually exclusive due to them sharing a value
B1 TRUE
B2 You take when it does not rain and multiply it by when the weatherman predicts it will and doesn't. Then take when it does rain and multiply it by when the weatherman predicts it will rain.
Then you multiply the days it rains by when the weather man is right and divide it by the previous. This will give us the asked outcome.
C1 (8/10) ten times gets you .1073741824 or .1074 or 10.74%
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