Premise: Young people sit on the rocks beside their recreational vehicle .
Correct statement: It is probable that some youngsters are cooling off in the shade beside their vehicle .
Incorrect statement: It is unlikely that some youngsters are cooling off in the shade beside their vehicle .
Correct statement: It is impossible that the people just finished a 10 hour drive .
Incorrect statement: It is certain that the people just finished a 10 hour drive .
Correct statement: There is a very good chance that there are people resting from driving an RV .
Incorrect statement: It is impossible that there are people resting from driving an RV .
Correct statement: It is impossible that a group of young campers at Yosemite sit near their RV .
Incorrect statement: There is a better than even chance that a group of young campers at Yosemite sit near their RV .
Correct statement: We believe that the group of people is camping .
Incorrect statement: It is probably not the case that the group of people is camping .