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In: Statistics and Probability

Of the 300 people that teach at Belmont, 225 are practicing Catholics and 75 are not...

Of the 300 people that teach at Belmont, 225 are practicing Catholics and 75 are not practicing Catholics. 90% of the practicing Catholics decided to get ashes on Ash Wednesday, and 30% of the non-practicing Catholics received ashes on Ash Wednesday

Joe got ashes. What is the probability that Joe is not Catholic.

A. Solve using Bayes theorem
B. Solve using a tree diagram

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