Lesson

What words can you think of that describe the the chance of something happening? Can you think of examples of events that fit each word you can think of?

What is the chance my paper plane will fly forever?

A

Impossible

B

In between certain and impossible

C

Certain

Worked Solution

Idea summary

These are the 2 terms we have seen to describe chance:

Impossible: definitely will NOT happen.

Certain: definitely will happen.

This video looks at 5 words to describe probability. Impossible, Unlikely, Even chance, Likely and Certain. We order these on a line similar to a number line.

Which section describes the chance of 'the next person you meet has the same birthday as you'?

A

B

Worked Solution

Idea summary

More terms to describe chance:

Unlikely: more likely NOT to happen than to happen.

Even chance: one thing is not more likely to happen than the other

Likely: more likely to happen than not to happen.

This video is about describing and ordering the likelihood of events.

The events A, B, C and D have probabilities as shown on this probability line:

a

Which events are more likely to occur than event B?

A

Events A and C

B

Events C and D

C

Events A and D

Worked Solution

b

Which events are less likely to occur than event C?

A

Events A and B

B

Events B and D

C

Events A and D

Worked Solution

Idea summary

To think about the order of events being likely or not, it may help to start with something that will definitely happen (certain) or definitely won't happen (impossible).

In order of how much chance something has of happening, we can start from the left, and move right. It's just like a number line.