Lesson T5.1.1

T5.1.1 Relative frequency, the 0-1 scale and totals of 1 Quiz: KS3 Maths, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson T5.1.1, Relative frequency, the 0-1 scale and totals of 1: 20 multiple choice questions for the KS3 Maths (National Curriculum), Unit 5: Probability, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. What is relative frequency?

    • Frequency divided by the total number of trials
    • Frequency plus the total number of trials
    • Frequency multiplied by the total number of trials
    • Total number of trials minus the frequency of the event

  2. What is the probability of a certain event?

    • 0
    • 2
    • 0.5
    • 1

  3. What is the probability of an impossible event?

    • -1
    • 1
    • 0.5
    • 0

  4. What does a probability of 0.5 mean?

    • The event is impossible, so it can never happen at all
    • The event is certain to happen on every single trial
    • The event is equally likely to happen or not happen
    • The event happens twice in every set of trials run

  5. A bag has 3 red and 7 blue counters. What is the probability of picking red?

    • 0.3
    • 3
    • 0.7
    • 0.03

  6. What do all the probabilities of possible outcomes add up to?

    • 0
    • 100
    • 0.5
    • 1

  7. A spinner has P(red) = 0.2 and P(blue) = 0.5. What is P(green) if these are the only colours?

    • 0.3
    • 0.7
    • 0.03
    • 0.2

  8. A coin is tossed 50 times and lands heads 27 times. What is the relative frequency of heads?

    • 0.27
    • 0.54
    • 0.5
    • 0.46

  9. A die is rolled 60 times and 6 comes up 12 times. What is the relative frequency of a 6?

    • 5
    • 0.2
    • 0.12
    • 0.8

  10. An event has relative frequency 0.25 in 40 trials. How many times did it happen?

    • 25
    • 4
    • 160
    • 10

  11. Which probability cannot be correct?

    • 0.14
    • 1
    • 0
    • 1.4

  12. On the 0 to 1 scale, which event is most likely?

    • 0.25
    • 0.5
    • 0.1
    • 0.9

  13. A spinner is spun 200 times and lands on blue 50 times. What is the estimated probability of blue?

    • 0.25
    • 0.5
    • 0.4
    • 0.75

  14. Probabilities of outcomes A, B and C are 0.3, 0.45 and P(C). What is P(C)?

    • 0.15
    • 0.75
    • 0.55
    • 0.25

  15. A fair die is rolled once. What is the probability of an even number?

    • 0.5
    • 0.67
    • 0.33
    • 1

  16. An unfair coin has P(heads) = 0.6. What is P(tails)?

    • 0.4
    • 0.6
    • 1.6
    • 0.06

  17. A bag has P(red) = 0.35, P(blue) = 0.4, P(green) = x and P(yellow) = 0.05. What is x?

    • 0.2
    • 0.8
    • 0.1
    • 0.25

  18. In 100 trials, outcome A happened 45 times, outcome B 35 times and outcome C 20 times. What is the relative frequency of C?

    • 0.02
    • 0.35
    • 0.2
    • 0.45

  19. A factory checks 500 items and 15 are faulty. What is the relative frequency of faulty items?

    • 0.03
    • 0.003
    • 0.3
    • 0.33

  20. A weather forecast says there is a 0.8 chance of rain. What is the chance of no rain?

    • 0.08
    • 1.8
    • 0.2
    • 0.8

All KS3 Maths quizzes