What is the probability scale?

It is a line that is used to show how likely something is to happen. It ranges from impossible to certain.

What does impossible mean?

Something that will never happen. It is not possible.

What is the next word up from impossible on the probability scale?

Unlikely

What does unlikely mean?

Something that probably won't happen, but it is possible.

What is next up from unlikely?

Even chance

What does even chance mean?

That something is just as likely to happen as it is not to happen.

What is next up from even chance?

Likely

What does likely mean?

When something is probably going to happen, but it might not.

What is the final word on the probability scale?

Certain

What does certain mean?

When something is definitely going to happen and there is no chance of it not happening.

What is the probability that you will turn 540 years old next Wednesday?

Impossible

If you toss a coin, what is the probability of it being tails?

Even chance

If there is a bag which has 10 sweets in, 5 red, 2 yellow and 3 green, what is the probability that I pick out a red one?

5/10 = 1/2

How do you find relative frequency?

Relative frequency = Number of times an event occurs / Number of times the test is repeated

Is probability written as a decimal or a fraction?

Experimental probability is written as a decimal, but theoretical is a fraction

How would you work out the probability of rolling an even number on a dice?

Probability = The number of even numbers (3) divided by the number of possible outcomes (6)
p(even number) = 3/6
