To determine which exhibit at a science museum is the most popular, the best group to survey would be every fifth person who leaves the museum one afternoon. This group will include visitors who have experienced the exhibits and can provide informed opinions about their popularity.
Surveying the museum staff who set up the exhibits may not reflect visitors' preferences, while surveying a group of classmates may be biased and not representative of the general visitor population. Likewise, surveying every person buying a ticket does not guarantee they have visited the exhibits yet. Therefore, surveying visitors who have just left the museum would provide the most relevant insights.
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