Probability refers to the chance that something will occur. A certain probability means something is guaranteed to happen, while an unlikely probability means something probably won't occur. Likely and unlikely probabilities compare the chances of different outcomes, with likely meaning a good chance and unlikely meaning a poor chance. Impossible refers to something that can never happen no matter what.

1. Probability
How Likely?

2. Probability
What is the chance of
something occuring?

3. Certain
Means that you are positive a red
gumball will be the only color
gumball that comes out of the
machine.

4. Likely
Means their is a good chance that a
red gumball will drop out of the
machine because their are more red
gumballs than blue.

5. Unlikely
Means that a blue gumball probably
won't come out because their is one
blue but a lot of reds.

6. Impossible
Means that a yellow gumball will
never come out of the machine no
matter how many times you crank it.

7. Equally Likely
Means their is an even chance of
red and blue gumballs coming out of
the machine.

8. Less Likely and More Likely
Has a close meaning to likely and
unlikely. This is just a differnet way
of comparing the objects you are
comparing.