A large outdoor recreational facility has three entrances. According to automatic vehicle counters, last year 11,976 vehicles entered at the first entrance, 24,205 at the second, and 7,474 at the third. A survey done at each entrance showed that the average planned length of stay was 3.5 days at the first location, 1.3 days at the second, and 6.0 days at the third. Estimate the typical planned length of stay for the entire facility on a per-vehicle basis.