Lesson 3p.03

3p.03 Use probability values to calculate expected frequency of a specified characteristic... Quiz: Pearson Edexcel Statistics, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3p.03, Use probability values to calculate expected frequency of a specified characteristic...: 20 multiple choice questions for the Pearson Edexcel GCSE Statistics (1ST0), Unit 3: Probability, written with Revision Ninja.

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The 20 questions

  1. How is expected frequency calculated from a probability and total trials?

    • Probability plus total
    • Total divided by probability
    • Probability minus total
    • Probability times total

  2. P(A) = 0.4 in 250 trials. What is the expected number of A?

    • 100
    • 625
    • 0.4
    • 40

  3. 60% of 500 people prefer tea. What is the expected number who prefer tea?

    • 300
    • 60
    • 30
    • 500

  4. A fair die is rolled 120 times. What is the expected number of sixes?

    • 12
    • 120
    • 6
    • 20

  5. The probability of a defect is 0.15 for 80 items. What is the expected number of defective items?

    • 0.12
    • 12
    • 1.5
    • 15

  6. A fair coin is tossed 50 times. What is the expected number of heads?

    • 5
    • 50
    • 0.5
    • 25

  7. Which two values are required to calculate expected frequency?

    • Probability and total
    • Mean and median
    • Relative and absolute
    • Sample and bias

  8. In a survey of 320 people, 25% are left-handed. What is the expected number of left-handed people?

    • 128
    • 80
    • 25
    • 32

  9. A defect has probability 0.03. How many defects are expected in 2500 items?

    • 83.3
    • 75
    • 7.5
    • 750

  10. 1200 people are surveyed and the probability of visiting a park weekly is 0.4. How many are expected to visit weekly?

    • 480
    • 120
    • 300
    • 4800

  11. 650 trees are checked and 18% have disease. How many are expected to be diseased?

    • 36
    • 117
    • 1170
    • 11.7

  12. A forecaster gives a 0.2 chance of snow each day for 365 days. How many snow days are expected?

    • 1.8
    • 730
    • 73
    • 18

  13. A class has 28 students and each has a probability of 0.35 of owning a dog. How many dog owners are expected?

    • 8
    • 10
    • 9
    • 9.8

  14. 400 cars are sampled and 5/8 are blue. How many blue cars are expected?

    • 5
    • 200
    • 320
    • 250

  15. A coin has P(heads) = 0.6. How many tails are expected in 85 tosses?

    • 34
    • 85
    • 60
    • 51

  16. The chance of a prize is 1/50. How many prizes are expected from 400 entries?

    • 0.125
    • 8
    • 50
    • 350

  17. Group A has 200 people with probability 0.3 of an event and group B has 300 people with probability 0.1. What is the total expected count?

    • 90
    • 30
    • 60
    • 120

  18. Why might an actual count differ from the expected frequency?

    • Always exact
    • Mathematical error
    • Random variation
    • Biased formula

  19. Each machine has 3 components, each failing with probability 0.02. For 1000 machines, how many component failures are expected?

    • 20
    • 600
    • 60
    • 6

  20. A test gives a positive result with probability 0.1 among 2000 people. What are the expected numbers of positive and negative results?

    • 2000 positive and 0 negative
    • 1800 positive and 200 negative
    • 100 positive and 1900 negative
    • 200 positive and 1800 negative

All Pearson Edexcel Statistics quizzes