Continuing with the Marriott survey done by the managers of a Marriott Courtyard Hotel, based on the data from the survey, found in the file CourtyardSurvey, determine the following probabilities using the relative frequency assessment method.
a. Of two customers selected, what is the probability that neither will be on a business trip?
b. What is the probability that a customer will be on a business trip or will not experience a hotel problem during a stay at the Courtyard?
c. What is the probability that a customer on a pleasure trip has an in-state area code phone number?