Homework Help: ap stats-- probability

Posted by zack on Wednesday, October 24, 2012 at 2:52pm.

over a 5 year period of time, 80% of winter days in Philadelphia had an average temperature above freezing. 20% of those days had precipitation. Of the days with an average temperature below freezing, 15% had precipitation. A winter day is chosen at random. Find the probability of a choosing a day:
a)freezing or precipitation
b)above freezing or no precipitation

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