# Question: A study showed that 60 percent of The Wall Street

A study showed that 60 percent of The Wall Street Journal subscribers watch CNBC every day. Of these, 70 percent watch it outside the home. Only 20 percent 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 these data.

(b) Calculate the probability of all joint probabilities (e.g., D ∩ O).

(c) Verify that the joint probabilities sum to 1.

(a) Sketch a tree based on these data.

(b) Calculate the probability of all joint probabilities (e.g., D ∩ O).

(c) Verify that the joint probabilities sum to 1.

## Answer to relevant Questions

A drug test for athletes has a 5 percent false positive rate and a 10 percent false negative rate. Of the athletes tested, 4 percent have actually been using the prohibited drug. If an athlete tests positive, what is the ...In the Minnesota Northstar Cash Drawing you pick five different numbers between 1 and 31. What is the probability of picking the winning combination (order does not matter)? A real estate office has 10 sales agents. Each of four new customers must be assigned an agent. (a) Find the number of agent arrangements where order is important. (b) Find the number of agent arrangements where order is ...Bob, Mary, and Jen go to dinner. Each orders a different meal. The waiter forgets who ordered which meal, so he randomly places the meals before the three diners. Let C be the event that a diner gets the correct meal and let ...The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a ...Post your question