Probability
UK Secondary (7-11)
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Certain, Impossible and In-Between
Lesson

In What could happen? we looked at how we can keep track of all the different outcomes in an experiment. Now we are going to look at some special words that we use to describe the likelihood or chance that an event or result will occur.

Remember!

These are $5$5 key terms used to describe chance:

  • Impossible: definitely will NOT happen.
  • Unlikely: more likely NOT to happen than to happen.
  • Even chance: equally likely to happen as not to happen.
  • Likely: more likely to happen than not to happen.
  • Certain: definitely will happen.

Worked examples

Question 1

What is the chance that next week will have $8$8 days?

  1. Impossible

    A

    Likely

    B

    Unlikely

    C

    Certain

    D

    Even chance

    E

    Impossible

    A

    Likely

    B

    Unlikely

    C

    Certain

    D

    Even chance

    E

Question 2

A game in a classroom uses this spinner.

  1. What is the chance of spinning an odd number?

    certain

    A

    even chance

    B

    impossible

    C

    likely

    D

    certain

    A

    even chance

    B

    impossible

    C

    likely

    D
  2. What is the chance of spinning a $2$2?

    likely

    A

    impossible

    B

    certain

    C

    even chance

    D

    likely

    A

    impossible

    B

    certain

    C

    even chance

    D
  3. What is the chance of spinning a number less than $8$8?

    likely

    A

    impossible

    B

    even chance

    C

    certain

    D

    likely

    A

    impossible

    B

    even chance

    C

    certain

    D

Question 3

Order the following events from least likely to most likely with the numbers $1$1 (least likely) to $5$5 (most likely).

  1. $\editable{}$ Winning the lottery

    $\editable{}$ A house that is randomly chosen has an odd street number

    $\editable{}$ Rolling a $7$7 on a standard die

    $\editable{}$ The sun will rise tomorrow

    $\editable{}$ Rolling more than $1$1 on a standard die

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