Math 7 · Unit 13: Probability · Cambridge Lower Secondary Maths Stage 7

Questions

1. 1. Question 1a: which of these events is very unlikely to happen?

   • The sun will rise tomorrow.
   • It will snow in a hot desert in summer.
   • It will get dark tonight.
   • You will get a head or a tail when you spin a coin.
   Check

2. 2. Which of these events is likely to happen?

   • You will win the lottery jackpot.
   • You will find a fish swimming in a classroom.
   • You will see the sun rise on a clear morning.
   • A meteor will hit the school tomorrow.
   Check

3. 3. Question 2a: you spin three coins at the same time. Describe the likelihood of getting three heads.

   • likely
   • even chance
   • unlikely
   • certain
   Check

4. 4. Question 2b: you spin three coins at the same time. Describe the likelihood of getting at least one head.

   • likely
   • even chance
   • unlikely
   • impossible
   Check

5. 5. Question 2c: you spin three coins at the same time. Describe the likelihood of getting three tails or fewer.

   • very likely
   • unlikely
   • certain
   • even chance
   Check

6. 6. Question 3a: Look at the probability scale from 0 to 1. Which arrow shows an event that is best described as impossible?

   Check

7. 7. Question 3b: Look at the probability scale from 0 to 1. Which arrow shows an event that is best described as very likely?

   Check

8. 8. Question 3c: Look at the probability scale from 0 to 1. Which arrow shows an event that is best described as a little bit less than an even chance?

   Check

9. 9. Question 4: match each probability to a description.

   • 0.7
   • 8/15
   • 4%
   • 247/250
   • 50%

   • extremely likely
   • more likely than not
   • even chance
   • very unlikely
   • likely
   Check

10. 10. Put these probabilities in order, with the smallest first: 5/8, 60%, 0.9, 46.7%, 17/20

    Put these in order.

    • 60%
    • 46.7%
    • 5/8
    • 0.9
    • 17/20
    Check

11. 11. Question 6a: Look at the probability scale from 0 to 1. Which arrow shows a probability of about 23%?

    Check

12. 12. Question 6b: Look at the probability scale from 0 to 1. Which arrow shows a probability of just over 3/4?

    Check

13. 13. Question 6c: Look at the probability scale from 0 to 1. Which arrow shows a probability of 0.55?

    Check

14. 14. Question 7a: the probability of rain tomorrow is 30%. The likelihood of sunshine is half the likelihood of rain. What is the probability of sunshine?

    • 70%
    • 15%
    • 60%
    • 35%
    Check

15. 15. The probability of rain tomorrow is 30%. The likelihood of strong winds is twice the likelihood of rain. Do strong winds have a more than even chance?

    • Yes
    • No
    Check

16. 16. Question 8: where would you show Hasini will definitely be late on a probability scale?

    • at 0.5
    • at 0.9
    • at 1
    • at 0
    Check

17. 17. Question 9: you spin a coin three times. The probability of getting three heads is 1/8. What is the probability of not getting three heads?

    • 1/8
    • 1/2
    • 7/8
    • 3/8
    Check

18. 18. Arun says the probability his team will win at least one of their next four matches is double the probability it will win tomorrow. Is Arun incorrect?

    • Yes
    • No
    Check

19. 19. Marcus' sister is taking a driving test. Do you agree with Marcus?

    • Yes
    • No
    Check

20. 20. Question 12a: the probability that a train will be late is 10%. What is the probability that the train will not be late?

    • 10%
    • 0%
    • 100%
    • 90%
    Check