# Tree diagram from written description

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A study showed that 60% of The Wall Street Journal subcribers watch CNBC every day. Of these, 70% watch it outside the home. Only 20% of those who don't watch CNBC every day watch it outside the home. Let D be the event "watches CNBC daily" and O be the event "watches CNBC outside the home."

(a) Sketch a tree based on this data.

(b) Calculate the probability of all joint probabilities

(c) Verify that the joint probabilities sum to 1

Please show how you get all calculations for the answer

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