Premise: Five hikers , one facing towards the camera and the others facing away from it , are walking through a rocky riverbed .
Correct statement: It is impossible that a group of hikers cross a rocky riverbed on the way to the summit .
Incorrect statement: It is almost certain that a group of hikers cross a rocky riverbed on the way to the summit .
Correct statement: It is probably not the case that hikers are videotaping their journy along the river .
Incorrect statement: It is certain that hikers are videotaping their journy along the river .
Correct statement: It is impossible that they are professional hikers .
Incorrect statement: Chances are about even that they are professional hikers .
Correct statement: It is highly likely that 5 hikers are fording a river .
Incorrect statement: It is unlikely that 5 hikers are fording a river .
Correct statement: It is impossible that five hikers stop to pose for a picture .
Incorrect statement: It is probable that five hikers stop to pose for a picture .