Official Explanation
RO1
According to the graph, approximately 12% of the tourists in 1993 stayed on the island for 7 days, and 50% stayed for 14 days. Thus, 12%+50%=62% of the tourists in 1993 stayed on the island for either 7 or 14 days. In 1998, 16% of tourists stayed 7 days and 25% stayed 14 days, for a combined total of 16%+25%=41%. In 2003, 22% of tourists stayed 7 days and 15% stayed 14 days, for a combined total of 22%+15%=37%. Therefore, the percentage of tourists who stayed for either 7 or 14 days is greater in 1993 (62%) than in 1998 (41%) or 2003 (37%), making the probability that a randomly chosen tourist stayed 7 or 14 days greatest in that year.
The correct answer is 1993.
RO2
As explained in the analysis of RO1, 62% of the tourists in 1993 stayed on the island for either 7 or 14 days. Therefore, the combined probability that a randomly chosen tourist that year stayed 7 or 14 days is 0.62, which rounded to the nearest tenth is 0.6.
The correct answer is 0.6.