A young boy jumping barefoot on a trampoline in his grassy backyard .
It is improbable that a young boy jumps on a trampoline wearing nothing on his feet
It is almost certain that a young boy jumps on a trampoline wearing nothing on his feet
It is improbable that a young boy jumps on a trampoline wearing nothing on his feet
A young boy jumps on a trampoline wearing nothing on his feet