A survey of adults aged 18 and older conducted by Princess Cruises asked how many days into your vacation does it take until you feel truly relaxed (USA today, August 24, 2011). The responses were as follows: 422—a day or less; 181—2 days; 80—3 days; 121—4 or more days; and 201—never feel relaxed.
a. How many adults participated in the Princess Cruises survey?
b. What response has the highest probability? What is the probability of this response?
c. What is the probability a respondent never feels truly relaxed on a vacation?
d. What is the probability it takes a respondent 2 or more days to feel truly relaxed?