A group of 11 smiling kids and young teens are divided into two groups , in a large , indoor swimming pool , with the back person in each group holding their arms up .
There is a very good chance that people are gathered at a swimming pool watching swimmers race .
There is a very good chance that people are gathered at a swimming pool watching swimmers race .
It is highly unlikely that people are gathered at a swimming pool watching swimmers race .
People are gathered at a swimming pool watching swimmers race .