A survey of a group of college students was done to find out how students get to school for the school year. 15% of those surveyed were from out of state. Of those that were in-state, 56% used a car as their primary form of transport to school, 13% used a train and 18% used a bus. Of those that were from out of state, 29% used an airplane, 31% used a car, and 12% used the train.
1) What is the probability that a respondent uses the train?
2) What is the probability a randomly chosen respondent is from out of state and uses the bus as his primary transport?
3) What is the probability that a respondent is from in state, takes an airplane or both?