A crowd of people are clapping their hands at a concert and some are wearing blue wristbands .
It is almost certain that a crowd wearing blue wristbands are clapping at a concert to show their appreciation .
It is almost certain that a crowd wearing blue wristbands are clapping at a concert to show their appreciation .
Chances are about even that a crowd wearing blue wristbands are clapping at a concert to show their appreciation .
A crowd wearing blue wristbands are clapping at a concert to show their appreciation .