A girl is jumping on a trampoline with her arms in the air , while a boy in a blue shirt is bouncing on his stomach .
It is improbable that a girl bounces on a trampoline with her brother .
There is a better than even chance that a girl bounces on a trampoline with her brother .
It is improbable that a girl bounces on a trampoline with her brother .
A girl bounces on a trampoline with her brother .