Suppose 42% of customers have internet service and 12.8% of customers have cable tv and internet service. Given that the customer has cable tv service, what is the probability of randomly selecting a customer that has internet service?
Ok so...
I thought the best way to do this would be to draw a Venn diagram.
I put P(of internet service)=43% in one circle.
I put P(of cable tv service)=57% in another circle.
I put P(of cable and internet)=12.8% in the intersection of the two circles.
So... do I need to find the intersection of P(of cable and internet) and P(Internet)? Is the answer just 12.8%? That can't be right...
I think I need to find the intersection of P(of cable and internet) and P(phone)? How do I do that? This type of question is driving me crazy.