At the Olympic games, many events have several rounds of competition. One of these events is the men's 100100100-meter backstroke.

The upper dot plot shows the times (in seconds) of the top 888 finishers in the final round of the 201220122012 Olympics. The lower dot plot shows the times of the same 888 swimmers, but in the semifinal round.

Which pieces of information can be gathered from these dot plots? (Remember that lower swim times are faster.)