A boy riding a Thomas the Tank Engine scooter and a girl riding a pink scooter are on the sidewalk .
It is improbable that a girl and a boy are playing on scooters and having fun .
It is almost certain that a girl and a boy are playing on scooters and having fun .
It is improbable that a girl and a boy are playing on scooters and having fun .
A girl and a boy are playing on scooters and having fun .